Engineered to transport the heaviest kayaks – up to 450 pounds Large balloon style beach wheels never go flat and easily roll over sand All-terrain, flat-free wheels (sold separately) will fit on same frame Bunker bar frame adjustable width prevents the kayak from twisting and slipping sideways two height options – high for odd shaped hulls that would usually rub on cart wheels, low for a lower center of gravity to prevent tip overs. no scupper posts prevent damage to the scupper holes of the kayak constructed of marine-grade, high-strength, heat-treated aluminum alloy for superior strength Two included security straps prevent the kayak from slipping Easy to load and unload the kayak – no kickstands or scupper posts required Collapsible and storable within large kayak hatches