Dynamic 420 Dolly - Single Tube (Type 1)Dynamic Dolly, Type 5 This style is made for heavier or double handed boats, e. g., Club 420, Capri 14. 2, Coronado 15, larger inflatables or aluminum boats with motors, and more. Boat specific tube and sling lengths provide a custom fit for each boat, enabling a balanced handle load and easy maneuvering. All joint fittings are through bolted and designed for increased torque stability. Strong, 3 non stretch, polyester sling provides wrap around boat