If you are going to run rocky trails don't use aftermarket 8" wheels. They will de-bead. With the tires you are talking about the 7" stock alloys are the best (yes - the 285/75/16) because their bead is excellent and most aftermarket stuff is crap by comparison. Also the wider tire really forces itself against the bead.
I've run stock rims (alloys and D110 steelies) for 20 years, on all kind of nasty trails, and the only de-beading I ever had was when I went to Pro-Comp 8" 8068 rims running 35" Nitto Mud Grapplers on my heavily modified 1991 RRC Hunter. Not a very tough trail, 12 lbs of pressure. Twice in 10 minutes. Irritating. When the same tires were on the stock alloys
This debate has come up many times on the D90 Forum and generally follows the same pattern as this thread.