Camping now no 110 power!!!!

Is your 5th wheel a 50A Service?

Are you plugged into 50A receptacle OR using a 50A/30A adapter?

Either way....
Sounds like 1/2 of your AC Power Dist Panel is NOT hot

Bad connection on one leg of power cord....either OEM or adapter

Sounds like your GFCI circuit connected to the inverter and the rest of the rig is not connected to shore power for some other reason.

Check breakers on inverter. What type of rig do you have? 30-50 amp etc

All breakers are on and not tripped. Hot water heater is on its own breaker and not working.
AC works and all GFI outlets inside and out work

Check you circuit breaker panel.