Do more checking. Gas on the burners works - LP OK. Furnace won't come on - 12vdc. AC won't come on - 120vac.
Check the TV, microwave and outlets - 120vac. Then check your interior lighting - do they work. Let's try to get a little bit better picture of what is going on.
You said you are hooked to shore power; is the breaker on in the ped? Are all the breakers on in the power center? Are there any fuses lit up?
Edit: Welcome to the forum! Sorry it's with problems.
Danny & Susan wife of 54 years
2019 Ram 3500 Laramie CC SB 6.4 4x4 4.10
2020 Montana High Country 331RL