I am not sure what you mean by taking it in the woods, but I have wooded property and a 3520 and the 3000 series is not an ideal choice for this. It just is too narrow of a frame, so at the very least get the R1s and turn the wheels to the widest position. My neighbor and I got two elk on the edge of his property last week and we took both tractors out (my 3520 and his 4120) and I really realized just how much more stable his is. While I was having to drive very slowly over the uneven ground, he was literally able to fly across it, and then he was able to drive down a steep bank that I could not (at least not without really gambling on my life). I know I have darn near rolled mine driving over ground at my place where I had been bucking tree limbs. I won't even use my tractor in those situations anymore as it is just too dangerous.
Good luck with whatever you choose.
-Jeff