I attached wheels directly to the legs on my 18. I have not had an issue so far. I just picked up a used 22 and am thinking I will do a triangle on the 22. Regardless of how you attach the wheels, you have to be careful moving it around.I have read many articles about wheel mods for a WSM. I would prefer to use 3" wheels going directly into the legs e.g. WSM not stitting in a frame. It seems a few think this might be tippy. I would appreciate any thoughts on this.