I bought and returned the X-Chock. Mine fit between the wheels but I could not easily spread them because the fender skirt support bracket was right between the wheels. Also, it says they are lockable but you have to buy that separately.
I am actually happier with the Fastway 84-00-4840 OneStep Wheel Chock. Pair for $80. I can use a cable lock through the wheel to keep them from being liberated. Just reach down, grab the cable and pull to release. I don't even bend over to set them, just drop down and scoot into place with my foot then set by stepping down on the top which spreads them into place. I could not be happier, the X-Chocks were a pain in the ass even without clearance issues.
2016 Cherokee 264L
2013 GMC Sierra Denali
EAZ Lift 1000 WDH w/Sway Control
2016 Nights Camped: 20 Trips: 7