Any racks that use coasters/ wheels ?

I believe you can get butcher block racks with threaded inserts and then find rollers or easy glide feet.

"Never understood why people don’t like coasters for the racks."
Simple. Rollers do not stop vibration.

"Not sure the isolation value is all that meaningful," I am 100% sure that isolation is meaningful even if not using a tt.

Another option is Herbie's Audio Lab Threaded Stud Gliders, i believe they work for racks as well.

I think the vibration rationale for improved sound when using coasters is laughable The only people saying they hear a difference are those marketing the product.

Yes you need to isolate a turntable obviously. components come with special feet that offer isolation as they should.

And amplifiers certainly don't need isolation as they are built like a tank and quite heavy. 
 

Maybe if you live on top of the subway platform or a raging Street prone with lots of noise but then why bother if this happens.

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