put a push/pull fan RV vent in the top- (removed 24V exhaust fans and put speakers in those triangle covers) I do a lot of desert camping and need the ventilation as it's my 'tent'. Bought a couple sliding tinted trailer windows- have to get the nerve to cut the sides to install 'em. Found two 'gypsy rack' US gov. contract Humvee roof racks on e-bay awhile back- 4x6 foot each- can fit both fore and aft of the roof vent, have to fabricate some mounting system for them. Inside back basically stock with one of the upper litters intact. Surgery light still there. Hi Lift jack bolted under one bench. Made a metal/wood insert between the lower benches, put a mirror image camera out the back window and another under truck showing front axle view with a 10" monitor so's I can see what's behind and in front of me. Found a gov't mil. vehicle add-on windshield fluid pump/reservoir unit and installed that yesterday- 12 volt wipers. endless possibilities-