Dont forget, at least with my 26rls, if you can get close enough to plug into your Tow Vehicle, that will give you power for your power tounge and slide out to operate (I know from experiance..lol) Our dealer had mentioned that during the walk through and it came in handy because I didn't disconnect my battery either and the parasite draw killed it. When it came time for our first trip it was dead. So I backed up till I was close, plugged in, raised the tongue, placed the ball and hooked up, brought the slide in. Saved me having to manually do it all!!!
2014 Jayco 26RLS
2014 Dodge 1500 4x4, 5.7 hemi, tow pkg