Thanks all! This is fantastic info.
I've been running a set of Wrangler (SRA, I think) tires I got at Walmart (due to a blowout I had on a road trip, and I needed tires anyway, so I said what the hell and get a set). They were the cheapest "light truck" tire that was in stock. I have to say, I have been pleased with them. They're not really an off road tire in any way, but they've served well, and are at about 50K miles, which is pretty good for $80/tire (I think the tread wear guarantee was for 50K which is about right). So if you are not looking for a more dedicated off-road tire, and want something that is cheap and last a long time, I can recommend those. With the Monty being retired to 3rd car duty, which is more wheelin' and campin' I'll be happy to get a more aggressive tire for my current uses.