It will probably never be more than 4-5 people but most times 2-3. I want to build one from scratch by raising 2-3 and putting a tent on top
@Paulo Filho
In my 4th gen 4runner, 2's company but 3's a crowd. You could do 4 if all of you are minimalist backpackers. Same goes for FZJ80. For a 5day Utah overlanding trip with 2 fellow photographers we needed to remove the 3rd row seats and one of the 2nd row seats, then add a canopy, recovery gear, and XXL Thule box to the roof. Everyone was comfortable but the rig was packed.
3rd gen 4runners are a bit narrower than the 4th gen, not sure on the 5th gens.
If 4-5 people are really being considered look at the Sequoia. Much wider, but also much heavier and a
smaller aftermarket than the 4Runner. 1st gen Sequoias are a bit smaller than the current models but are still comfortable. (I've done multiple 1-2 week trips in a 2004 with 4 adults, gear, and a Newfoundland dog.) Add some real off road tires and it'll go down most forest roads and carefully selected trails here in CO. Expect some backing up / off camber situations when you pass others on a trail and to get thoroughly pin striped on narrow trails.
If you stay with the 4Runner and want grab and go off the lot convenience than I'd say the TRD Offroad, if you want to upgrade the suspension to your specs SR5 then add the suspension you want. Either way I'd recommend getting the SEMA TRD PRO rims as they are lighter than the stock ones which helps when increasing tire size. (I'm running these 5th gen rims on my 4th gen for this reason.) As an aside: The TRD FOX shocks are commonly upgraded to aftermarket and sold on craigslist around here for $500-$700.
Boort