AC Power loss

I have a 2010 Spree 265 KS, last weekend we were camping in Tofino, vancouver Island, during torrential rainstorms. Humidity was 90 percent so we decided to use an electrice heater to try to warm up the trailer. The heater ran fine until I got up and turned it up, pop, no AC Power. I unplugged and immediately checked the breakers, none had tripped but I opened and closed them all. No luck. I checked the power post for a breaker but nothing so got the camp staff to check in the power shed, nothing open there neither but they opened and closed it several times and camp with an adaptor to prove power to the post and it had power. Unfortunately we had been dry camping for a few days before and planned to charge the batteries at the camp ground so minimal power. I physically inspected all of the fuses, no burnouts, checked the GFI plugs, none tripped. Eventually we did not have enough power to start the furnace and there is no RV support as Tofino is at the end of the road, so used the truck power to pull in the slides and we headed home.

Got home, tested AC breakers, all fine. Still no AC power., I keep reading about a breaker near the batteries on the tongue but there does not appear to be one on my unit. 

Anybody have any ideas???