Welcome! Nice rig. Only problems i know with your truck is the possibility of cracking a piston when/if you decide to tune it. Lots of good and knowledgable members on this forum.
I had crap shocks last winter, decent tires, but was still running my 20's. I had no problem driving in 2wd, only time I ever used 4wd was on steep driveways.
A friend of my roomates has a dmax for sale. Has a blown head gasket i think, possibly just a leaking cup. New injectors tho. Pm me if you want some more details.