- Kit includes hardw are for mounting to the Thor VM1 Smart Dock VM1001VMCRADLE or the Marathon vehicle dock FX1005VMDOCK.N/A- RAM ball size D (2.25 /57 mm).N/A- 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.