I currently have 31X10.5R15 on my 89 on stock wheels, they ride really good, but they look small.
I'm going to try some 285/75R16 from one of my other vehicles and see how they ride and look. When I do it I'll get some pictures and post them.
For brands: Cooper Discoverer ATR have been one of the best tires, they don't make them anymore, now they have the AT3, which I haven't tried, but have very good reviews.
I just finish my second set of Cooper Discoverer ST Maxx, and I was dissapointed. I ran 2 sets at the same time in 2 different trucks, and only got 25K miles out of them, but they were very bummpy and really hard. I'm currently running Firestone Destination AT, 8K miles and very happy. Also, Mastercraft Courser AT2, 15K miles and really good. Also Nankang MT, but only 2K miles on them, so far so good.