I bought my Smoke Hollow 4-in-1 and built it with the mods I found on this site and blogs to make it a good smoker. I keep it in my Garage covered to avoid rust. The problem I had is my first smoke on it I had to take it from the garage to the back yard across wither grass or unfinished ground. With the small plastic castors that come on it this didn't work out so well. It was a royal pain in the behind to get it around the house. So I thought what would Tim Taylor do? In true Tool Time fashion I monsterized it with some steel plates and 10" pneumatic tires. Now it rolls all terrain style and it increased the height 11" which is actually perfect for grilling and loading the smoker. My wife bought me a sign for it so I put that on the front while I was at it.
The size difference between the stock and new wheels
Rolls like a dream.