US$ 24.00
The Seitech spread is wider and therefore you need the appropriate axle tube
The type 10 Dynamic dolly is for flat-bottom boats
such as the Hobie Mirage Oasis
such as the Annapolis Wherry 17'9"
2 dolly is made for heavier sprit boats such as the 49er
REVERSO AIR Aluminum Tubes - Round The Seitech spread is widerThe Type 7 dolly style has a more upright bow tube for boats with a plumb stem, such as the Reverso Air.