Scupper Swift has an adjustable-width axle that makes it the best sit-on-top cart on the market. Slide your boat easily on to, or off of, the coated and cushioned uprights and away you go! A super beefy 35mm anodized frame can take all sorts of abuse, while the new airless, vibration reducing, solid urethane tires eliminate all flat tire hassle. Maximum load capacity is 150 pounds.