I'd buy em for 31 x 10.5 R15 tires on TJ or XJ. They are ideal for that.
However, I would want a 31 x 9.5 if I go to 31s some day. For a 9.5 wide tire I prefer a 7" wide wheel. Like 245/75R16 (31 x 9.5 R16) on 16 x 7 Icon wheels.
Lots of people will want your 15 x 8 Canyon wheels for $275 to $300 for 5 in good condition, or $200 to $250 for 4 in good condition.
Advertise in classified section at JeepForum, Ebay, Craigslist.
Ebay pays the best for sellers, IME, but it's not free. The other 2 are free.
Warning: I often edit my posts a few times to get them complete or correct errors.