This probably isn't going to go over well, but a two track machine on a trail with a washboard-like surface is constantly oscillating up and down. It's not a pleasant experience.
A few years ago snowcat buddy/partner in crime Scott (aka:The Gorilla) and I took a Tucker 1544 and a DMC 1450 out for testing. Same day, same conditions, it was a fair head-to-head comparison. During the day we switched machines a few times, and when the day was over we compared notes over a sarsaparilla, or two.
Both machines ran well and there were no mechanical issues affecting either machine. We agreed the DMC 1450 performed well (truthfully, it exceeded our expectations). I'll pause for a moment and say this was a modified 1450 in that it had extra wide tracks. But the ultimate question was "Which machine do you prefer" and we were both in agreement the Tucker 1544, with its four-track system was better.
At the 2022 Sun Valley Serenade (I think that's the right one) none other than the Infamous WBJ1 drove that DMC 1450 for a day, and his comments on the ride mirrored ours.
Honestly, it's the nature of the beast.