I bought my 5th wheel last year & we always have trouble at night with low amperage. This has happened at every park we go to. Some parks have been worse & it's always worse at night. We were at a really crowded park this last week & it was really bad at night. Does this sound like a inverter problem, battery problem or over crowded park? It seems like everywhere we've been this year has been really crowded. The camper is a 2006 Fleetwood, bought used. Royce