I did some thermal calcs based on the insulation value walls, ceiling, windows, floors and interior volume. Doesn't include loses to leaks in slides, or heat injected by persons or sun. It require 12800BTU's to cool from 90 to 70... So 15000BTU is pushing the limits - 2 units would definitely be better but not an option on these sized C's.
My understanding is there should be a UVW as delivered stamped on the vehicle which should tel me what it really weighs vs the spec from the brochure. is there a way to tell axle loading empty without going to something like a CAT scale? I don't want to wait until after i buy it to get this data. Its an e450 GVWR 14500, weighs (brochure) 12780lbs leaving 1720 for people cargo, water... GAWRR 9600 smf GAWRF 5000