How to build your own kayak cart that is lightweight and floats for $25. Purchase plans from this site. Appears to be made of push lawn mower wheels and axel surrounded by a configuration of PVC pipes and elbows. Covered in foam; that looks like a dollar store pool noodle. Add a web strap band to hold kayak to the cart.
Craftsman 37430 21 Inch 140cc Briggs and Stratton Gas Powered 3-in-1 Push Lawn Mower Briggs and Stratton Silver Series 5-torque - 140cc engine21-inch cutting width, low 7-inch front wheels, high 11-inch rear wheels3-in-1 cutting methods (side discharge, mulch, or bag clippings into rear bag) http://industrialsupply.mobi/shop/craftsman-37430-21-inch-140cc-briggs-and-stratton-gas-powered-3-in-1-push-lawn-mower/