cardboard here for many, many [and many] years.
my floor has really rough cement, and creepers never roll worth a hoot.
i have a pretty good supply of large cardboard sheets stashed overhead, so when i ruin the current one in use beyond redemption, it gets replaced with a new one.
i sure wished i added height on my garage roof when i replaced it all those years ago.
a lift would be SO nice now that i'm an old coot.