We have 50 now, but our 30 amp 5th wheel ran ACs, TVs electronics well. However I'm a stickler with the thermostat. Learn where its' "real" temps are. Most thermostats are not accurate, however it you have an idea to help it cycle on and off that will help. We have microwaves, however rarely use them. Don't just plug in and turn it to 50 degrees like you're in a hotel. Easier said than done on those 100+ days though.
2015 Georgetown Forest River 351DS MH
2008 Keystone Cougar 293SAB 5th Wheel
2007 Jay Flight 30.5RLS 5th Wheel
2006 Jay Flight 29BHS TT