I have 2 Dunlop Mud Rovers, 30x9.50x15 with about 75% of the tread left. I have had them taking up space in my shed, and then my garage, and now they are outdoors (for 2 months now). I don't think they are dry rotted or anything... they're good tires. I'll double check on their condition tomorrow but I'm feelin' pretty certain they are worthy of a DD. I bought them in a set of 4 on eBay for my '92 YJ (now long gone), but the seller ripped me off by saying they were like new, 3K miles. Two of them were, but the other two were badly cupped and more than half worn. I threw the bad two out, bought a set of 32's, and these have sat ever since.
If you want them they are yours. PM me with your address and I'll send them via UPS or Fedex ground (whatever is the cheapest way to go. You can reimburse me for whatever the shipping is on the label via Paypal after you get them if you want to.
My wife would be glad to see them go as she has aked me repeatedly to toss 'em. I just couldn't throw good tires away. Hopefully you take 'em!