Truck is simply impossible to build !
Wrecked 2 dually chassies 1 RAM3500 diesel and 1 GM3500HD and 2 J truck bodies, It can be drawn but it can NOT be built.
The RAM chassie I couldn't get the front axle to center in the wheel well. So I removed the 12V-Cummins and got the body setting right couple of test fits with the 19.5s all was good. Then came re fitting the power train everything seemed to interfere with something else. Lost my cool one day the J-truck body RAM chassie n cummins diesel all went to the crusher and was destroyed !
So I spent 3wks thinking then I remembered about the 92'-98' GM-3500HDs those came with 19.5s and heavy GVWs.
The GM chassie was easy to find, bought a second rust free complete J-truck front half body n chassie fit together queit well excpet for the huge wheel well gap from top of tire to bottom of wheel well, chalked it up to missing engine test sat a BBC under hood didn't squat enough. So I bought a 24V cummins diesel got that sat. Into place but still looked ugly but I got driving around anyway.
After trying to run a size bigger tire then another size bigger tire still not looking right. This is when I realized the GM floor pan and Jeep oor sit differently. The Jeep body tho mounted at same hight visually appeared 6" higher because the jeep body sat mid frame rail and the GM sat below. So after trying to lower the body to no avail I crushed it ! ! !
So 2 perfectly good dually 1tons wrecked, 2 rust free J-trucks destroyed, and 2 Cummins diesels wasted I gave up thousands $ in the hole and hundreds of hrs wasted.
Now I didn't try using a Ford Chassie yet ! ? !
But I went another route bought an 82' J/10 Honcho stepside shortbed I'm going to swap J/20 Axles n springs under it drop an AMC-390 under the hood mated to a T-18 with 4.27gears and Run polished SRW 19.5 rims, add a Goose neck ball and heavy duty receiver hitch.
I felt this was a better route instead possibly wasting another 1ton chassie and J-truck body