Kelly Safari Trex

Anyone have any experience with this specific tire. Im going to be putting on some new rubber in the next month or so and I found these at a local shop 4 on my splorer out the door for 544. i will eventually want to get a spare mounted but im sure ill have to modify the spare mount or get the rack on the back.

Any info. Also... Yes I did do a search, but came back with the Kelly MTR or others. Didnt see any for the trex.

thanks in advance.