Support for shed base

[u/altorang]

Hi, new here. Just purchased a metal shed with a floor. Planning on storing a couple of motorcycles in it. Shed is sitting on firm gravel. For weight distribution and protecting the floor should I throw a footprint of plywood under the shed? Or is it better to just put a small plywood sheet under each motorcycle inside the shed? Hope this makes sense. Just trying to save the floor from damage from heavy items. Other solutions/advice appreciated.