Nay
Observer
I think this much is clear, and you'll need to make a major decision before continuing a search:
With 3 rows of seating in service, you're either going to need a mid-size truck, like a Disco2, LR3, FJ100, Armada, etc AND towing a trailer to carry the gear. OR, you're going to need a FULL SIZE truck, like the Excursion. That's the only way you'll have enough room. I doubt you could get all your gear on a roof rack on a mid-size.
This is good advice. However, much of your success will depend on how you pack and how much "roominess" matters to you for back country adventures. It also matters how old your kids are - the 80 is an 8 seater with small kids (if you add back a center belt in the 3rd row). It is a four seater for adult sizes over material distances.
I personally do not want a full size rig in the back country. Heavy rigs beach badly when they hang up on things (the 80 is bad enough) and my personal approach is I'll pay the compromise in having to really pack every inch while retaining far more basic offroad capability than I should need than having a lot of extra room and wondering if I will make it across the stream bed.
I like to design for the 1% situations, knowing that this compromises the 99% to some degree. This gets into tire choices, lift choices, suspension and armor choices, and so forth, after choosing the base vehicle.
I also love being able to look down an unknown trail and say "let's check it out" (words that make my wife's palms start to sweat :sombrero
I do need a trailer and I am going to be starting a ground up project soon. I should really just get a popup (and a supercharger to go with :Wow1