Specs at 2 3500lb axles box is 20ft long by 8.5ft wide by 8.6ft tall door way is 6.3 ft tall by 7.6 wide has new floor from previous owner I installed new lights track on the floor diesel heater and a solar panel on the roof to keep the battery charged to run the diesel heater storage and flag holder for four wheelers I also installed the window in the man door axles been greased every 6 months and checked for play