– Kit includes hardw are for mounting to the Thor VM1 Smart Dock, VM1001VMCRADLE, or the Marathon vehicle dock, FX1005VMDOCK. – RAM ball size “D” (2.25 ?/57 mm). – Kit includes a flat clamp type RAM ball f or the vehicle side mounting. These clamp balls attach directly to the roof support arm of most fork lift vehicles without the need for additional mounting hardware.