Any racks that use coasters/ wheels ?

I added large rubber wheels my TV rack. My audio system solid steel vertical rack being roughly 19 x 19 was too unstable. I recently replaced it with a solid maple table top 5 x 2 x 2", it rests on 2 @ 20 x 20 end tables under each is a large harbor freight dolley. The improvement in all 3 dimensions, as well as bass, puts a huge smile on my face every time I play a CD

hth

so the fact that it's on coaster wheels doesn't impair sound quality. Mobility is extremely important for this heavy equipment.
 

Common sense tells me that rubber wheels are important to avoid vibrations reaching the floor and vice versa.  
 

I think all this isolation crazed people need to focus on common sense approaches.  Spending thousands and thousands on these crazy racks it's kind of bizarre
 

+1 on Herbie’s threaded gliders.

Adona racks can be had with threaded inserts suitable for heavy duty casters, the likes of which are available from McMaster Carr and other similar places. 

Out of sheer practicality, I decided to buy dollies to place under my Klipsch Lascalas. At 175 lbs. each moving them conveniently was impossible. However, the sizes of dollies were less than ideal and seeing how simple they were, I decided to build my own. It all worked out great. I placed 8 isolation pads between the dollies and the bottom of speaker. They are virtually unseen and now I can shift the angle and position of speakers with one finger. But this is where it gets interesting. The enhanced clarity of both mids and treble was shocking. Even so. my situation is unusual due to my floor being so unstable. Did the same with component rack with less improvements but still noticeable in upper frequencies. Very much worth the effort.