Re: 2WD or 4WD???
I have had my Polaris Sportsman 400 4x4 since 1994. I have an adjustable v-plow for it and I take it in deep mud and sand every other weekend. When it comes down to plowing and mud-bogging, you can't beat 4 wheel drive, especially Polaris. It's also good in sand. Even though it has the stock super-aggressive tires, it still hooks-up great. I haven't gotten the thing stuck in any terrain yet and I beat the piss out of it.
So, for your application, go 4x4 and go Polaris.
97 Chevy shortbed Z71, 350, 5-speed, 6" Superlift, 33x12.5 Swampers
94 Polaris Sportsman 4x4 400 - bone stock, but bada$$