About a year ago I locally purchased an Ampeg 8x10, the guy I bought it off of said the original owner replaced the casters on it. The casters he put on it were a little too big, causing the cab to slightly tilt forward. It never really caused any problems, but now the wheels are starting to deteriorate. What is the best solution for replacing the wheels? I've seen on here some people go to Home Depot to just buy more casters to put back on it. If that is the case, is there a specific size of wheel I need? I've also seen people switch to having 4 wheels on the cab. My only concern is it rolling away. I assume I could get locking casters. Are those the best 2 options I have?