XCAT Launching Hull Cradles
The Launching Cradles are the easiest to use as a solo sailor and are perfect for launching and retrieving from concrete boat ramps and moving the boat over hard ground like dirt, it struggles a bit in super soft sand.
Tires measure 10" x 3"
I do want to note that you only really need Launching Cradles if you are moving the boat over longer distances of dry ground. If you plan on assembling your XCAT on the beach near water's edge,you will probably find the boat is easy enough to just push into the water on its keels.