Hey randycr1,
Welcome to the forum.
No matter which camper you have I would imagine your battery can get the slide out and then back in once you're ready to leave. Do you have to rely on the trailers battery, solely, for this however? Can you leave it powered by your tow vehicle for these big drains? I'll do this same thing. Just leave the truck close by and running so I can power the trailer through my truck for slide and toungue Jack needs while leveling and then closing her up and hitching up to leave.
My big question will be what kind of demands will you have on the house battery while you are camping? Ok, actually I can think of many questions but I'll just ask a few more.
Which trailer do you have? Do you only have one 12v battery? Which one is it? How old is it and what is its current condition?
Do you also have a generator?
Tell us more about your camper and your electrical demands for the trip. Where are you headed? East up into the mountains?
Sorry. I asked a lot of questions.