what size of tongue jack do I need?

Just a quick note to say thanks for all the feedback, I ended up getting the ultrafab 3500 and installed it myself. It already had a 20am circuit breaker with the jack, so like you said, just three bolts, splice the fuse holder into the wire and connect it up. Seemed to work just fine, I installed this weekend and will get more of a test when we take it out for Memorial day weekend. Heading to Lake of the Springs here in northern Ca.

Thanks again!