More info, as seen from behind the wheel of a TJ on 35s:
I first ran HTT back in 2012. I have run it at least once per year, every year since then (except for 2018, sadly). For the first few years, the trail difficulty remained fairly constant. But then suddenly for 2016 (if I remember right), the difficulty went up significantly--it seems there was a lot of runoff that spring, which eroded much of the dirt portion of the trail. This is an issue because there are numerous places where you navigate around large rocks by putting one side's tires on the rocks and the other side on the dirt, and what used to require driving over a 12"-18" tall rock ledge tuned into driving over a 24"+ rock ledge. All by itself, that's still not a big deal when you're on 35s... but when you also have to make tight turns and careful maneuvers, the difficulty level goes way up (along with your chances of getting high-centered on said rocks).
There are plenty of places where you will lean your rig way over to one side or the other. Sometimes this forces you to lean right into a large rock. You should expect tons of wheel rash, plus gouges to your fender flares. My current aftermarket flares are not as flexible as the stock ones were, and I ended up destroying one and ripping another the last time I ran HTT. This didn't bother me, but if having that happen would ruin your day then you may want to reconsider running this trail.
Somewhere, I have dash cam footage from running the entire trail. These files are way too big to post here, but if anyone wants to see them perhaps we can get together for a small viewing party. Let me know.