Most people including myself say that a 3500 watt 30 amp generator is good for overall camping power. It will run ONE rooftop AC unit, as well as lights and small appliances. Your unit being a 37 footer probably has 2 AC's on it, however. Also, microwaves are a big power hog, as well as the heater.
/SIGPIC]'08 V-lite Flagstaff 30WRLS
'06 Ram 1500 QC hemi
Reese dual cam sway control,
K&N series 77 intake, Hellwig helper spgs. LT tires,
Flowmaster "true duals", 380 h.p., Bilstein shocks