I've searched and thought I would be able to come up with some discussion, but, alas.....
has anyone taken a truck box and put some kind of trailer frame underneath and add axles to convert it to an enclosed trailer? Or even a tongue setup?
He's asking $875 for this 16x8x8 truck box.
Underneath a normal enclosed trailer is an outer frame with cross-supports with a cut-out section for the suspension and wheels/tires (ie like a normal flat bed trailer. Yah there are variations but typically).
Why not do the same with a standard 20' or larger truck box? The truck box has a similar frame setup under the floor, so trimming and boxing in the suspension shouldn't be a problem. Adding torsion axles would be the easiest to do. Adding wheelwells for the tires is little effort. Most truck boxes are tall enough to stand up and jump in without hitting roof. The roof would also be plastic to let the natural light in.
Would it be heavier by quite a bit?
A 16' truck box conversion wouldn't cost the $3-4000 for an enclosed.
has anyone taken a truck box and put some kind of trailer frame underneath and add axles to convert it to an enclosed trailer? Or even a tongue setup?

He's asking $875 for this 16x8x8 truck box.
Underneath a normal enclosed trailer is an outer frame with cross-supports with a cut-out section for the suspension and wheels/tires (ie like a normal flat bed trailer. Yah there are variations but typically).
Why not do the same with a standard 20' or larger truck box? The truck box has a similar frame setup under the floor, so trimming and boxing in the suspension shouldn't be a problem. Adding torsion axles would be the easiest to do. Adding wheelwells for the tires is little effort. Most truck boxes are tall enough to stand up and jump in without hitting roof. The roof would also be plastic to let the natural light in.
Would it be heavier by quite a bit?
A 16' truck box conversion wouldn't cost the $3-4000 for an enclosed.