Motorhome Cummins ISC Severe Power Loss. Resolved!

This is my rambling tale of the Cummins ISC in my motorhome and the severe power loss we experienced on a recent trip, the troubleshooting and the easy fix.
PacBrake Lube:
www.amazon.com...
Below are links to the items I purchased to add the second fuel filter.
Fuel filter head:
www.amazon.com...
AN Fittings Fuel line kit:
www.amazon.com...
Hose separator clamps:
www.amazon.com...
AN fuel Line Coupler:
www.amazon.com...
Fleetguard Fuel Filter:
www.amazon.com...

[@jimcalver-oj4xf]

Good info to know, thanks. We are looking at a rig with a 2007 5.9l ISB, purportedly able to do 300HP, and will have a good look at all the mechanicals before embarking on the road. What HP are you squeezing out of your engine and do you find that sufficient? Do you normally have a TOAD on with that?We hope to have a small sedan on a dolly to tow. Also, you mentioned scangauge; is that on normally displaying engine data while you are driving?

[@mickeyj4228]

The ISC is a 8.3 big block, 350 hp and 1050 lbs torque. I tow a 2018 RAM 2500 that weighs 8300 lbs and a Dodge Dakota that weighs about 5000. They both tow the same.