I'd like to build platforms for my EP800s to sit on that will roll around but lock into place when I want to position them more permanently. This would make playing with positioning a ton easier, but what drawbacks can you foresee? If I'm to proceed with the idea, does anyone have recommendations on a specific brand and model of locking caster that is nice and heavy-duty with smooth rolling action that is also big enough to roll easily on rugs/carpets?

Thanks for any suggestions you may have.