I move my smoker to the other side of the patio for each use and always wanted caster wheels. I used (4) 3" pieces of 1-1/8" c.r. steel, chamfered the edges. Drilled and tapped 3/8" hole through each piece. Slide easily, but tight in each leg of the smoker. Used threaded stud, 2" caster wheels. $23 and works great.