We're onto something huge here...
My friend, you're an inspiration to us all, with your thinkin (& performing)out of the box. As I stated b4, I've already built similar to what u have, believing a medium duty Isuzu FTR 4door, straight six diesel,4sp Allison, 22.5GVWR, 14' Cab to Axle, then 13' Axle to end of beaver tail, was ideal Ca$h Cow with potential to gross $200k/yr as a Haul&Tow, pulling 2travel or cargo Trlrs. Heck, 99.9% of RVs(TT's & 5th whl's) are pulled by $20k-$70k 1ton trucks that then never get backhauls. & these skoolies have same engines(5.9TD, 7.3TD, 8.1 Vortec, etc) that p/u trucks have,& bigger like 3126, DT466, that're staples of class 6-8 trucks. My Isuzu
FTR gave decent 10mpg, but was hard to find parts for and expensive ($3500 radiator, $4000 inject'n pump, $3000 brakes,)assuming I found mechanics to work on it.
These skoolies are what I plan to use to build a fleet of Haul&Tow fltbds. Having 5.9 Cummins or DT466's or 7.3 DT444's w/Allison5&6spds, derated for longevity, we're just SO lucky nobody wants them, making skoolies the best value available. I wish more of the 26k to 30k gvwr ones could be rated down for those of us without CDL-A's. Kudo's to our friend, MrFriend for opening our eyes to how easy and cheap these trucks can surpass the needs of farmers and for hire truckers everywhere.