Casters to replace spikes

So I'm sure this will get a lot of challenge and flak, so please helpful comments only!

Long story short my focus has changed from home theater to two channel back to home theater.  Recently got a projector and in the midst of getting a screen (have a white sheet hanging as temporary) . On a whim I moved my Revel studio 2s and Voice 2 behind the sheet which improved the movie experience 1000%. However I had to push the speakers back against a wall, which is not ideal for two channel listening. I'm planning to purchase an electric screen so on occasion I'd like to be able to pull the speakers out from the wall with little effort when the screen is rolled up. Right now they are on the factory spikes sitting on Herbie's discs, so they can slide on the carpet with some effort. However, every time I've seen Wilson speakers in show rooms, they always seem to be on casters which made me wonder if that's a normal type of arrangement or at least a good enough arrangement.  my system is decent but my room needs lots of treatment so I'm taking an 80/20 approach here.  

Has anyone done this/ can recommend any type of solution for being able to move the front speakers with ease?  Thanks!