If I were to redo my bus, I would not use 2 13.5K A/Cs again. I have a well insulated coach with thermopanes and am sure that these A/Cs are too large. Dallas pulled off 2 13s and replaced them with 12k!!! and he says it works well. Coleman sells 8,300btu roof units that pull 8 amps. I do not know what the locked rotor amps are, but I think two would work on 30 amps. If my ACs go bad, Ill put the 8's on and let you know the results.