My sammi was stock with some 30 inch super swampers, i wheeled it on dirt trails, sand, and mud.
It did way better than i though it would do, i was in 2 wheel drive most of the time. (the thicker mud was holding me up so i had to use 4 but it pulled through it with no problem) There were guys in yotas that were having a hell of a time even with 4wd, so I'm guessing that the low amount of weigh the sammi has really helped me on that one.
A vehicle that is set up for what terrain you wheel on is always going to do the best.
Lift it only as much as you need, then run a nice size tire on it. Lockers with make you unstoppable!!
Amilla