Honestly, there is no comparison between the TB and a H3 or other ICE Hummers (cannot speak for the new GMC Hummer versions).
The only clearance spec that the TB excels in when compared to a H3 with off-road package and 33" tires is ground clearance.
TB ground clearance is 10.7"; H3 10.5"
Approach angle TB 28.7 deg / H3 39 deg
Breakover angle TB 16.8 deg / H3 23.7 deg
Departure angle TV 27.2 deg / H3 36.3 deg.
(TB clearances found here on TB website in a previous posting / H3 clearances are from memory of GM supplied info on the old, now closed Hummer site?
As for power, the H3 had a good strong 5 cyl engine (later a V8 was offered). It did not have a great towing capability and I can attest a large off-road popup trailer was about it for the H3 and it did not like it hanging off it's rear end on the interstate.
I ran almost every trail, at least once in Moab with the H3; EXCEPT for Pritchett Canyon and Coyote Wash. I did run part of Pritchett but was smart enough to stop before I completely destroyed the H3 and gave myself a heart attack.
A few trails, such as Moab RIM I ran twice and then decided I hated each time I ran it and never went back for a third try. But I also walked in once and that was some walk up.
All the years in Moab and running all those trails and never any body damage except for the rear bumper, and only once was there any damage to my body and that was when the Hummers got together one fall day to run Lockhart Canyon a few weeks after a massive flood went through the canyons. And that day, was a day to remember. I was standing next to an H2 that was maneuvering a nasty side slope and someone yelled at me to move and I did quickly (too quickly to be precise). I jumped to my right and there was nothing but space and down I want to a ledge below. Broke right arm in five places, wrist in three places, broke a bottom right rib when my Sig's barrel end hit a bolder and slammed up into my lower right chest.
And the fun part was, we had NO extra drivers riding gun, so rather than leave the H3 behind, I drove it back to a parking area off Kane Creek, where a BLM ranger ( good friend) met us and was able to get me to the Moab Hospital faster than it would normally take, for body repairs.
But until that little accident, we had a great time climbing over boulder and boulder.
View attachment 19237View attachment 19238
View attachment 19239
View attachment 19240
I was in the Solar Flare (Orange) H3.
Now why did I get a TB? I liked it, I wanted something that was capable to pull a small trailer down some nasty dirty/rocky roads in AZ, NV, UT, CO, ID, WY and MT. And being older, I wanted some more creature comforts and inside room for me, my partner (for insurance purposes) but in reality a girl-friend and a large dog. So the TB met the requirements and I like the idea of a small 6-cyl diesel and the Silverado is a good looking truck.
From what i have seen, only thing that might need an upgrade are the tires. As much as I don't want a harsher ride, a 3-ply sidewall might be in the future due to some of the roads I'll be traveling. Not technical roads, I'm past that stage, but roads where nasty sharp rocks may lie hidden meaning I won't have to change a tire in the middle of a trail.