126 views and no replies....? I guess there are no experts here, so how about the opinion of a Monday morning quarterback?
I have test driven a few of the new Tacomas, but not off road at all. There are certainly enough members here who have, so I am going to say they would make a great truck for family adventure vehicle. Seems to be plenty of aftermarket support for the suspension, which will be the most important system to modify (I believe), for a truck & slide-in combo. The Finch model would be the perfect compliment to a new Tacoma.
I'm partial to my T100, primarily due to our history together and that it's fairly unique among this type of travelling. However they are all 10 years old at least and they're getting harder to find with low miles. The one drawback I can't overcome is the lack of 3rd & 4th doors. It's my only complaint and they would be a nice convenience, but not a necessity.
If a tree fell on my outfit tomorrow, and State Farm put a fat check in my hands to replace it, I would move up to a '04-'06 double cab Tundra and a FWC Hawk. The Hawk model is slightly wider than the model I have now but based on where I have been, it wouldn't limit me at all. A d-cab Tundra would also be longer than what I have, but the V8 and rear doors would be a welcome addition. I would add an ARB locker, some BFG KO's and feel comfortable that I could handle a large percentage of my favorite trails in WY, CO, UT, ID and MT.
Now if just my truck died tomorrow but my FWC were still operational, I would move up to a first gen x-cab Tundra. The access doors would allow me to place gear and kids in car seats in the back seat more easily. The FWC I have now will fit on an x-cab bed, but not the Tundra d-cab bed....
I think the ultimate off-road set up might be a Dodge Power Wagon and a FWC, although I heard/read somewhere that Dodge suggests not putting a slide-in camper on their Power Wagon....? A Cummins of any vintage with good tires and a FWC would make for a nearly bulletproof adventure vehicle.