Not exactly sure what you are asking here. I'm interpreting as the battery is not in the trailer but you are hooked up to shore power; and things aren' working. I can say that our Surveyor works under those circumstances. If the battery IS in the trailer, any chance it is hooked up backwards? Also, have you checked all of your circuit breakers?
2012 F150 FX4 Ecoboost, 2016 Surveyor 274BHS
2003 Yamaha FJR1300, Demco Premiere Slider
1969 John Deere 1020, 1940 Ford 9N, 1948 Ford 8N
Jonsered 535, Can of WD-40, Duct Tape
Red Green coffee mugs