Generator
I installed an Onan 5500LP in my 3600RL with the ability to run both roof A/C. The 6500LP is heavier and costs more $$$$. The Onan 5500LP will cost about $3400 on line. I researched diesel, gas and LP. The diesel weighs about two hundred pounds more and is very expensive. Gas means adding a gas tank and more weight. The propane is there and ready for hookup. I chose Onan because of their track record and extreme quiet operation over Generac even though Generac is several hundred dollars less. Watch out for the 290 lbs. increase in hitchpin weight overloading the truck's GVW or tire load rating.