I have an 08 Flagstaff,with a 30 amp plug, and I run the water heater, converter, refrigerator, AC on high, and have never tripped the breaker ... Oh and the Concertone surround sound with sub, while playing a DVD movie, and viewing it on the 22" TV -all on and STILL no problem. But with all that on, I tried to cook with my electric frying pan, and it then tripped the main on the post outside. So we cut the AC off till we finished. Sounds like you have a short in something, possibly. I have the WFCO converter, dometic ref., 13,500 btu AC, and 3 way 6 gal. water 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