Saul - if you are going to Moab in May hopefully you will get to see my Baja Claw 33x13.5"s and I can give you mroe information on them then. I don't have them yet. As far as the fit, I can definately se the 31"s rubbing if you put them on a stock height vehicle, and because of the tread it would probably be a somewhat violent rubbing, I have no proof thats just based on my guess. Get a body lift then you should be able to fit them. I'm not sure how they will do on road, but I have been told they are somewhat loud and the ride is a bit rough, once again I should be able to let you know better by Moab in May.
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Matt Adams
94 Explorer 4-door nick-named "Tippy"
http://bart.is-s.com/~explorers/explorer/explorer.html