Besides slapping some casters on a piece of plywood - what else have folks come up with for mobile storage under your layout ?
Rich
Rich,
Your question has come up many, many, many times before here on the forum.
I suggest typing the phrase "under layout" in the box entitled Exact Phrase Match on the Search page.
You'll be able to see solutions to your hearts content. True some of them are about lighting, and a few others on creepers for navigating underneath, but most will be worthy of consideration to fit your needs.
Mike