I have 14" wheels with about 7.5" of space between the wheels. The xchocks say the expand to 10", but it that at center or the tops and bottoms? How do I know if they will work for me?
Look in the Do It Yourself/Modifications topic. I just put a post there on making your own wheel chocks that will work for any size spread on your axles. The title of the post is "Homemade Wheel Chocks".