I got the chance to try the new Malone Auto Racks Xpress Scupper-Style Kayak Cart.  It is a simple design but might be a great accessory to have at a very reasonable price of $79.99.  The cart is fully adjustable to fit about any kayak that has scupper holes - this is great for those of us who have multiple kayaks - like myself. The wheels are 10" and I used them on some pretty touch terrain and they seem to be pretty well made.  The cart comes with a foam block that you use so your kayak can sit on but I didn't use it. The cart breats down super fast and I think it will fit in about any front hatch.