The wheels are for hard surfaces only. I think the tires are rated at 400 lbs. each. They are hard rubber, no air and you can get them on Amazon. I built this unit for my back porch not the backyard. I have a forklift so I can move it anywhere. I would suggest if you want all terrain, get small boat trailer tires. The larger the tire surface the easier and more stable the smoker is when you are pushing it around on softer surfaces.MattJ wrote:Nice build. How do those wheels do on grass? What size are they?
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