I always liked using X-chocks to help stabilize the trailer when camping, but the one's I own are useless with Prime Time's E-Z Tow wide axles.
I had intended making my own this winter and never got around to it. I found some DIY instructions using 4x4's. They were for the normal tire spacing, but I was going to try and cut the length of the 4x4's to fit.
There aren't many places that I could find that sell the The Bal X-Tended Tire Locking X-Chocks, but I did find a pair for $162.95, including shipping (can't recall the web site). A seller on ebay had a pair for $196.95, including shipping. I made an offer and ended up paying $152.95 including shipping for the pair. Ordered on friday, they shipped on monday and I received them today. That's pretty good considering I used standard shipping. Everything was as ordered and in new condition.
Here's a link to the ebay site if anyone is interested; BAL X-Tended Tire Locking X-Chock For Rv Camper New - eBay (item 230590958176 end time Mar-28-11 12:26:35 PDT)