Welcome to IRV2! We're sure glad you joined the gang!
I agree with Steve. It sounds like a low chassis battery to me. Try using the boost switch that connects the house battery to the chassis battery and see what happens. Keep her between the ditches!
Good luck, happy trails, and God bless!
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD