Clarifications, comments & links Towing Calculator l2sfbc.com/towcalc/ How to deal with sway ua-cam.com/video/PS_T3-zCzHw/v-deo.html Why your trailer sways ua-cam.com/video/nc0ndz92IWY/v-deo.html Also when I said the front axle was green, that meant it was within its load limit, NOT that it was safe - the problems with unloading the axle are explained. Front a commenter: "One further point to using tie downs on the car body/chassis - this places huge shock loads on the straps and the car body itself when the straps tighten during suspension rebound. We had issues when I worked at Holden, with new vehicles being delivered on trucks from Adelaide to QLD. It took a lot of tracking down, but we finally realised it was only occurring when the cars were transported on trucks that used older "chassis" tie down systems. The rebound shock was so high that it was destroying the fluid filled engine mounts as the body suddenly stopped but the engine kept raising. The loads on those straps must have been huge."
Fantastic detailed explanation as always. One further point to using tie downs on the car body/chassis - this places huge shock loads on the straps and the car body itself when the straps tighten during suspension rebound. We had issues when I worked at Holden, with new vehicles being delivered on trucks from Adelaide to QLD. It took a lot of tracking down, but we finally realised it was only occurring when the cars were transported on trucks that used older "chassis" tie down systems. The rebound shock was so high that it was destroying the fluid filled engine mounts as the body suddenly stopped but the engine kept raising. The loads on those straps must have been huge.
- Heavy towing drivers should at least go out and get themselves a LR/MR license - and it would be a great thing during training for these courses if the truck be used to operate with a loaded trailer (up to 9 tonne trailer are allowed on Rigid truck licenses).
Probably $130,000 plus of vehicles totally and utterly not insured. If they had an accident and killed someone they would lose their cars, house and likely be jailed or heavily fined at minimum.
I'm surprised there wasn't more mention of the fact that it is going 95km/h on a dual carriageway. Maybe you could cut them a tiny bit of slack for considered moronism if they just needed to hop it a suburb or two at low speeds to get to a mechanic. At highways speeds and distances, that setup is just madness.
Unfortunately, the people who need to see this probably don't watch your videos. I live in a rural area, where a lot of people cart water in the ubiquitous 100L IBC, either in the back of the ute, commonly a dual cab, or on a trailer. Physics was a lesson in school where most of them stared out the window.
Same for caravaners, so many have never towed anything more than a tiny garden trailer in their lives. Spend their retirement package on a big van and 4x4, then head straight off on an adventure tour.
Prado's listed tare weight is very conservative from the factory, 2300kg doesn’t include fuel or the tow bar. So in reality they're nearly 2500kg without any other mods. Wouldn't surprise me if that the towed Prado is closer to 3t than 2.5t.
When towing a car on a trailer, if i cant keep it back on the trailer to keep it over the axles as much as possible, I will load them rear first and see how that looks.
@@L2SFBC yeah i put that bit of the comment in half way through and then noticed you did address it. So I had removed my bit about the front axle before seeing your reply! I shouldn't jump the gun!
I have to ask, what is the point of a car trailer that is limited to a payload of 1200kgs? Other than very old cars, nothing would fit within that limit now.
Fair point. Back in the day many cars were lighter and would fit. Now only the smallest cars will be 1200 and under. The limit of 2000kg unbraked has not changed and that is what had driven the payload as 2000 - 800 tare is 1200 payload.
- haha, I came to your channel today to ask a trailer related question - another interesting one for a video idea maybe. - I hope this is a little on topic.. Terrible overloading on a passenger vehicle's rear end is not a great thing to see.. - You are more experienced than many in securing cars on trailers- ALL car trailers SHOULD be equipped - especially if rented (duty of care) - with wheel straps - preferably - heavy duty load rail ??E-Track - on the deck plates. Effect of Trailer Drawbar length on stability. - The "10%" drawbar loading" - for a typical PIG trailer, does not take into account Moment arms. ie. Taking into account the moments for different dimensions: trailer box placement - assuming uniform loading for bulk materials), drawbar length, vehicle mass distribution ( Vehicle CG, Passenger and payload CG) wheelbase and Towbar overhang... To achieve the typical 10% "tongue weight" (on the ball) the box trailer will be loaded around 20-30$ of the allowed payload weight on or adjacent to the leading edge of the box. Longer drawbars lessen the force on the ball, while not affecting the actual trailer weight distribution, ?? effects on dynamic stability in the treadmill model?? Noting: IF a vehicle can be loaded to near GVM, and then tow a 3000kg trailer ... ...(not heavier than the towing vehicles actual mass - not a GVM/GCM/GTM/ATM/... thing - as with heavy trucking, the actual load distribution matters, as is noted in reference to heavy rigid vehicles towing dog or pig trailers -GCM under 43000kg, without an Engineering Assessment / Study of the specific combination -.of the light and heavy trucking weight distribution - in combination trucks the lightest trailer should be last (and dollys really should be loaded the same as the tail).. ... Reduced Towball weight through the effect of a longer drawbar restoring vehicle dynamic conditions to "controllable" under most forseeable conditions. ( NHVR - NHV Mass and Dimension limits page4: "The maximum GML for a combination is 42.5 tonnes unless operating under a notice permit or specific scheme. ͧ CML heavy vehicles must be accredited under the NHVAS. ͧ HML heavy vehicles must be fitted with road friendly suspension and accredited under the NHVAS.")
Yes, there is no fixed definition of the ideal towball mass as it is very dependent on a lot of factors, like "what's the best tyre pressure". What is your specific question?
Another video discussing something which you’re not remotely qualified to talk about!🙄 I love how when someone who does have the relevant training & qualifications tries to correct u on anything, your reaction is basically, “well, I have a UA-cam degree. So I’m right & you’re wrong!”🙄 I look forward to your videos when u start teaching people how to perform surgery! 🤣
Which part of the video was incorrect? Where have I said that? Nowhere, is the answer. You're upset because you said my video on a 2:1 MA pull was wrong, and I refused to agree with you. My justification was the experiment I showed, not "my UA-cam degree".
You serious mate? If you think Robert's points here aren't valid, you need to go do some (very basic) learning about physics and probably the vehicle regulations too.
Clarifications, comments & links
Towing Calculator l2sfbc.com/towcalc/
How to deal with sway ua-cam.com/video/PS_T3-zCzHw/v-deo.html
Why your trailer sways ua-cam.com/video/nc0ndz92IWY/v-deo.html
Also when I said the front axle was green, that meant it was within its load limit, NOT that it was safe - the problems with unloading the axle are explained.
Front a commenter:
"One further point to using tie downs on the car body/chassis - this places huge shock loads on the straps and the car body itself when the straps tighten during suspension rebound.
We had issues when I worked at Holden, with new vehicles being delivered on trucks from Adelaide to QLD. It took a lot of tracking down, but we finally realised it was only occurring when the cars were transported on trucks that used older "chassis" tie down systems. The rebound shock was so high that it was destroying the fluid filled engine mounts as the body suddenly stopped but the engine kept raising. The loads on those straps must have been huge."
Fantastic detailed explanation as always.
One further point to using tie downs on the car body/chassis - this places huge shock loads on the straps and the car body itself when the straps tighten during suspension rebound.
We had issues when I worked at Holden, with new vehicles being delivered on trucks from Adelaide to QLD. It took a lot of tracking down, but we finally realised it was only occurring when the cars were transported on trucks that used older "chassis" tie down systems. The rebound shock was so high that it was destroying the fluid filled engine mounts as the body suddenly stopped but the engine kept raising. The loads on those straps must have been huge.
Great info thanks, not considered that, will add to pinned comment!
Another excellent explanation Robert.
Just goes to show how important it is for completing a course prior to being allowed to tow a trailer.
Glad you found it helpful!
- Heavy towing drivers should at least go out and get themselves a LR/MR license - and it would be a great thing during training for these courses if the truck be used to operate with a loaded trailer (up to 9 tonne trailer are allowed on Rigid truck licenses).
no course required, what we need is $10000 fines for imbeciles doing this
I have an HR licence and none of what I talked about was taught. Didn't cover pig trailers.
@@kadmow another feminist Marxist
Hilarious. The jimny is priceless too.
Probably $130,000 plus of vehicles totally and utterly not insured. If they had an accident and killed someone they would lose their cars, house and likely be jailed or heavily fined at minimum.
I'm surprised there wasn't more mention of the fact that it is going 95km/h on a dual carriageway. Maybe you could cut them a tiny bit of slack for considered moronism if they just needed to hop it a suburb or two at low speeds to get to a mechanic. At highways speeds and distances, that setup is just madness.
Unfortunately, the people who need to see this probably don't watch your videos. I live in a rural area, where a lot of people cart water in the ubiquitous 100L IBC, either in the back of the ute, commonly a dual cab, or on a trailer. Physics was a lesson in school where most of them stared out the window.
1000L not 100
@RedDog265 Correct. I got excited.
Edit. Also, fairly okay IF full. If not full, dangerous due to free surface effects.
I wonder what the real world emergency stopping distance of that Prado rig would be. Not sure you could even safely test it.
Crumpled chassis I reckon ey
Same for caravaners, so many have never towed anything more than a tiny garden trailer in their lives.
Spend their retirement package on a big van and 4x4, then head straight off on an adventure tour.
Cops would be preferable to the states transport department. Far more thorough inspections and maybe higher fines.
Scariest thing I've seen on the internet this year 😮
Don't forget to get your boosters 💉💉💉💉💉💉
Prado's listed tare weight is very conservative from the factory, 2300kg doesn’t include fuel or the tow bar.
So in reality they're nearly 2500kg without any other mods.
Wouldn't surprise me if that the towed Prado is closer to 3t than 2.5t.
Agreed, I prefer to give benefit of the doubt. Who knows what was inside too. Tools, gear, drawers...
When towing a car on a trailer, if i cant keep it back on the trailer to keep it over the axles as much as possible, I will load them rear first and see how that looks.
The front axle is within weight limits. It is dangerous despite being so.
@@L2SFBC yeah i put that bit of the comment in half way through and then noticed you did address it. So I had removed my bit about the front axle before seeing your reply! I shouldn't jump the gun!
I have to ask, what is the point of a car trailer that is limited to a payload of 1200kgs? Other than very old cars, nothing would fit within that limit now.
Fair point. Back in the day many cars were lighter and would fit. Now only the smallest cars will be 1200 and under. The limit of 2000kg unbraked has not changed and that is what had driven the payload as 2000 - 800 tare is 1200 payload.
50/50 is perfect, if you're talking about performance driving. A lot more comes into it, but on balance that's ideal for many reasons.
Why do you say that?
- haha, I came to your channel today to ask a trailer related question - another interesting one for a video idea maybe. - I hope this is a little on topic..
Terrible overloading on a passenger vehicle's rear end is not a great thing to see..
- You are more experienced than many in securing cars on trailers- ALL car trailers SHOULD be equipped - especially if rented (duty of care) - with wheel straps - preferably - heavy duty load rail ??E-Track - on the deck plates.
Effect of Trailer Drawbar length on stability.
- The "10%" drawbar loading" - for a typical PIG trailer, does not take into account Moment arms.
ie. Taking into account the moments for different dimensions: trailer box placement - assuming uniform loading for bulk materials), drawbar length, vehicle mass distribution ( Vehicle CG, Passenger and payload CG) wheelbase and Towbar overhang...
To achieve the typical 10% "tongue weight" (on the ball) the box trailer will be loaded around 20-30$ of the allowed payload weight on or adjacent to the leading edge of the box. Longer drawbars lessen the force on the ball, while not affecting the actual trailer weight distribution, ?? effects on dynamic stability in the treadmill model??
Noting: IF a vehicle can be loaded to near GVM, and then tow a 3000kg trailer ...
...(not heavier than the towing vehicles actual mass - not a GVM/GCM/GTM/ATM/... thing - as with heavy trucking, the actual load distribution matters, as is noted in reference to heavy rigid vehicles towing dog or pig trailers -GCM under 43000kg, without an Engineering Assessment / Study of the specific combination -.of the light and heavy trucking weight distribution - in combination trucks the lightest trailer should be last (and dollys really should be loaded the same as the tail)..
... Reduced Towball weight through the effect of a longer drawbar restoring vehicle dynamic conditions to "controllable" under most forseeable conditions.
( NHVR - NHV Mass and Dimension limits page4: "The maximum GML for a combination is 42.5 tonnes unless operating under a notice permit or specific scheme. ͧ CML heavy vehicles must be accredited under the NHVAS. ͧ HML heavy vehicles must be fitted with road friendly suspension and accredited under the NHVAS.")
Yes, there is no fixed definition of the ideal towball mass as it is very dependent on a lot of factors, like "what's the best tyre pressure". What is your specific question?
Omg, accident pending for sure.
Would have used weight distribution bars and travelled around 70 to 80 k's hr
Really - NFI
I want to know why you advised against balancing your vehicle on a pyramid???😮😮😮😂😂😂
What has the world come too!? )))));
"and how it do it right" - English Robert!
oops fixed thanks
We aim to please!
Another video discussing something which you’re not remotely qualified to talk about!🙄 I love how when someone who does have the relevant training & qualifications tries to correct u on anything, your reaction is basically, “well, I have a UA-cam degree. So I’m right & you’re wrong!”🙄 I look forward to your videos when u start teaching people how to perform surgery! 🤣
Which part of the video was incorrect?
Where have I said that? Nowhere, is the answer. You're upset because you said my video on a 2:1 MA pull was wrong, and I refused to agree with you. My justification was the experiment I showed, not "my UA-cam degree".
@Mechengineer321, Was that your car in the video?
😁😁😁😁
@Mechengineer321 Dumb comment of the year award has been decided. Nobody will beat you for the rest of 2025..
You serious mate?
If you think Robert's points here aren't valid, you need to go do some (very basic) learning about physics and probably the vehicle regulations too.