I purchased a set of 4 this weekend to move my 240Z and a rock crawler project around the shop. There were no sales and I didn't have a coupon either, dang it. They almost got me with the 10% for a credit card but I didn't see it worth only $50. But I digress. The ad says these only accept up to a 34x 11 tire. I rolled a 35x12.5 into the store to check. The dolly fit with ample room. The quality is pretty good. It is still a 2 person job to make things go quickly and smoothly. The Z was easier than the crawler even though they're close in weight. I'd have a hard time spending twice the money on Go Jacks. They can't be that much better unless a 5000 lb car could be moved like ball bearings on a pane of glass.