What happens if (and I say "if") your tow vehicle is not accessible (like, it gets wrecked, or in the shop for repair, or you are having mechanical problems) and then for some reason you need to move the camper. A different tow vehicle will not be equipped to operate the same as you are proposing.
You can do it, and it will work, but you need a back-up plan if the tow vehicle is not accessible. Perhaps install an alternative plug off the trailer battery you can plug the power jack into for a "just in case" situation.
I think then you'd have the best of both.
Actually, if boondocking is your chosen style of camping, then you might be best to stick with a manual crank jack. Less dependency upon the battery that way.