Folks, if you haven't tried it yet, take the time to get over to Marble Falls and go to Boulder Creek Off Road
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http://www.bouldercreekministries.org/offroad.html
They've got 3600 acres with flat trails, quasi mountain climbs, class 5 rock crawling, water obstacles and the list goes on and on. The only thing they don't have is dunes. I've been twice with txmd500 as a guide and the last time we took another friend with a rhino and he did well too. They are making improvements all the time and it is a well run place. Just my .02. Oh yea, did I mention it's dusty in the summer time!
I ran the place completely stock and did OK. The class 5 stuff is marked for 35" tires and we still did OK, though I did order a 2" RD lift and a winch for the next trip. First trip I pulled txmd500 outof the water, 2nd trip they pulled me out of the water. I noticed today on their website that they are serving breakfast and lunch at the gate now.