i would say no problem, the ul deal is cause of a safety not in useing it.
while driving.
how often do you drive with the windows open?
long enougth to charge up the house batts from the pu alt?
to power something that requires 110 ac?
most reffers even poor ones will hold cold temps for hrs.
can you bend some sheat metal? just make a cover over the top and comes down about a 1/4 wat. with suport struts. aka: miny shead thing.
as to the exhaust??? send it down through a hole in the bed and outlet at the side of the truck?? up say about half a foot above the cab??.
