I used to go into the sand with older vehicles with no problems. A lot of my buddies go to Pismo all the time. Their biggest problem is sand in the door panels messing up the fragile window parts. I think if you tape them up with blue tape, all will be well. There's not much that sand's gonna goof up besides that (and rollin' one over!) Running them in salt water looks really cool but really, if you love your H3, it's not very smart. That corrosive crap gets pushed into places that you'll never ever be able to rinse it out of.
ARB's got some awesome air lift bags that can get anyone out of a sand or snow stuck. I may buy one.
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