I bought my first 97 Holiday Rambler DP for $30K, and it was in almost perfect shape. However, that was years ago, so the value would probably be $22K or so now....
I would fix the electrical stuff and then trade the unit in. I wouldn't try to hide any problems, and the dealer most likely will wholesale it off...so he wont fret over the condition. He won't be sitting on it...he just needs to know the issues and then he can make the call about passing on condition to protect his reputation.
You could probably get more selling it yourself, but then you need to get it ready to sell and it sounds like you don't really enjoy that kind of work and your market is a pretty small customer base. Not sure it is worth your time or effort. Please don't take this wrong...I'm usually not willing to do the work myself either. I don't have the talent, and prefer to pay to have the work done right rather than screw it up by myself!
'07 Holiday Rambler Endeavor PRQ ("Elvis"), and our 2012 CRV toad