used to use the x chock. my 5th had 15" now 16 " not enough space for easy use. it came with 1 PAL wheel chock. should I need two. these spread to fit under wheel. are they as good.
I have also used RotoChoks for years. Had to modify them to fit my new trailer. I hit Craig A's link and am saddened they are out of business. I dealt with Pearl when I bought mine, a nice lady.