My only thought, is that those wheels are going to rust and stain your patio, even if they're painted, the paint will scratch off as it's rolled around.
Maybe some of that rubber coating used for tools might help?
Meat eater. Woodworker. PS3 Gamer. Home Theater Guy. Beer Drinker.
WSM 22.5 and random cooking stuff used to help form my shapely manly figure.