Yes Rick, as I said in the first post, I would get a set of slicks smaller diameter than the street tires. I'm not that dumb.
I don't understand why 31" tires won't fit? The only hard part is getting them on and off. Once on they have plenty of room. The one set of tires I had, I had to jack it up by the frame, then put a small bottle jack between the rear and the arch in the frame and jacked the axle down to get them on. A bit of a hassle but it worked.