Thanks a lot for the replies! This makes things easier. Even though I'm not very handy, it should be easy to put wheels on some hardwood and try it out.
Wheels under tube amps?
Can tube pre and amps be put on wooden boards or glass shelves with wheels without any loss in sound quality? Or must the rack be heavy and stable? I am looking for a practically solution for my equipment that at the moment are placed directly on the wooden floor underneath a big sideboard. Can't have it on top, they are too big.