Astro turf. Winner and crap for the environment too!
yu could try silicone sealer?
Park on the garden instead?
I buit a "kitty litter" tray. Sheet of 4x2. Laths around the outside. Four laths (side to side) underneath so there was less surface area in contact with the drive so it was easier to move. Put in an inch of gravel and hey presto.
4x2s seems rather industrial - Is this to safeguard against being driven over?