I have a 99 4runner and a 2019 Tundra, i used to have a 2004 sequoia... I tow a tow toy hauler with d/w @ 3k lbs, adding just camping gear (no toys yet) I'd safely say it's 4k lbs.
I drove to Idaho (from AZ) in the sequoia + trailer and it's was, well, lacking, I even bought a SC for the 4.7 and before install, my wife 'tricked' me into the Tundra
same route with the trailer but in the tundra, wow, what a difference, keeping speed up grades, getting up to speed with trailer, yeah, it was nice. world of difference. word of advice, don't get the TRD exhaust... not best with trailers, I'm very happy i don't have it.
I can't imagine towing this with the 99 4Runner, yeah it's 'rated for 5k lbs' but I don't believe that's today's standards.
I do offroad, I don't like the skinny trails personally, I can't imaging taking the tundra off any other road than normal forest roads. the lack of any 'offroad' modern gadgets really sucks, but at least it does have traditional 4wd, and 4.30 gears... adding a locker with make it equal to my 99, except for the size.
that being said, the tundra can hold it's own offroad. without the locker you may need momentum on your side for 2 wheel moments.
I too am afraid of truly offroading the tundra, it's huge, but like others have said, keep it simple. I think over time it's just going to be more natural to offroad the tundra.
__________________
1999 3rd gen Ltd 4wd 3.4 auto dif lock -
Build Thread SOLD!
2019 Tundra Sr5 CrewMax - 1 owner
Doubt kills more dreams than failure ever will.