you'd be dumping with a 5th wheel attached? or even with a trailer on a hitch? if the box can tip all the way up pivoting from the rear spring mount, sounds like someone cut the frame quite short, probably to accommodate a dump from a previous truck .... pics would probably get some suggestions

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics