I was going to suggest using the winch on the front of your Jeep. If it's really a "just in case" thing that might get used someday but mostly not...why waste money on a all that and the battery which will just sit and rot. I've dragged tons of non-running vehicles up on a trailer using a come-a-long and a length of chain...takes about 15 minutes all in, sometimes have to use a snatch block to double the pull, but the battery won't go dead and its useful for lots more things.