They don't make the 35" reds anymore I don't think. They come in a 15" rim, and sometimes can be found on pirate. 37's only come in 17" and the same with 39's. They make 42 but they are 20" rim.
To get red labels you need to be a sponcered racer by bfg or else know someone. I can get new one's but they aren't cheap, but like jemery said they are a trailer only tire. Used ones can be found on pirate and hardline. I bought mine on hardline. These tires work the best at close to half tread and down.
Your drive train is in constant bind in a way. Yes, my 37's are too big for the rubi axles, but with the fact of having a trailer, chromoly rear, and rcv front I'm ok if something goes, but damn if they just don't make the jeep crawl like a mountain goat.
Another option are the bfg krawlers that you can find at 4 wheel parts and the likes, know as blue lables. They aren't as good as the red's but they way better than the km2. These are the street version of the red labels with the same tread design. The rubber is a little harder because they can be ran on the street but still pretty soft. They will wear quicker than the average mud tire. I bought a 37" blue lable as my spare.
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