My kids (2.5 boys), ride their trikes down the driveway (a small, safe
incline) and use my shed to stop the ride. Eventually, they are going
to damage the wooden door.

Any thoughts about what I could use to prolong the life of the shed
door? I checked out the local HD, and didn't see anything that I
thought I could use as a safe bumper.

Anyone have any thoughts or suggestions on this?