Without an extension, your Rubicon on the trailer is going to add 660# to the rear axle. So with an extension, you can figure it is going to be closer to 690#. This assumes just the jeep and trailer, not much gear or spares stacked on it.
Quick look at the floor plans and I'll rule out the Adventurer 910DB because there isn't hardly any storage down in the main floor. Putting all the gear up by the bed isn't convenient, especially on those mornings when your wife wants to sleep in but you want to hit the trails early to beat the rush.
TCM wet weights for the other two are AF992 @ 4,900 and Lance 975 @ 4425. But since the AF comes with more standard features, the weight is probably going to be much closer than the numbers show. Both of those campers are well built so it basically comes down to the floor plans.
In floor plans, I have to give my nod to the AF because of the smaller sink but larger floor space of the bathroom. After all, do you really need a large sink space in the bathroom?
With the weight, figuring about 6,200# total, you will need to at least have a heavy duty rear sway bar and probably air bags to be happy with the ride. May also want to think about an equalizer hitch for the trailer which will help transfer the tongue weight off the rear axle.
By the way, I use to haul a built CJ-8. Then I finally realized wheelin was fun, but just camping was relax. Enjoy your adventurers.