Lucky,

Those Michelins in the pictures are what I refer to as "Maypops" - may pop now, may pop later. Dude, they are dry rotted and cracked pretty good...those tires were shot well before the tire grenaded.
That is exactly why I wouldn't pay $500 for a brand new set of XL's no matter how new they were. Like I said, when I saw a set that had less than 100 miles on them and were on a garage kept Power Wagon with cracks, I knew any others I would see down the road were going to have the same problem. Sure enough, I have yet to see any XL's with cracks...you may be able to use them, but I would only use them as bumpers on pilings when you dock your boat!
Stick with new rubber...I bought a new set of Power Kings for $160 out the door each - fresh and they look great. Sure they may be two inches shorter than a XL, but at least I am worry free for the next decade!
Just my two cents!