I have Dunlop Rover Touring LT's (275/70R16) on my wheels. Nice tire. I've put about 30K miles on them so far, and still have 1/4" tread left. I'd buy Dunlops again, based on my experience with these. I don't know about the all-terrains, though.
I have the Dunlop RV XT's, they DON'T LAST! I've gone through 2 sets, all of them not lasting more than 20-25k....i wouldnt invest in them, seeing as they are around 100 bucks each...cheaper tires last longer.