You are making a simple problem into a complex one by thinking of a mobile platform. I strongly suggest you do not use a mobile platform, but simply put them on casters. I have used a few speaker systems on casters and they are wonderful for ease of positioning.
People may insist that spikes are necessary to elicit the best performance. While that may be true, I have not found it to be the case. I have used many speakers that have spikes, and frankly, the speakers that have had casters performed better with casters, largely due to the elevation of the speaker raising the sound stage. In addition, there are literally dozens of potential advancements to systems, and almost never are all of them employed. Imo, spikes are among the least important of the changes that can be made to audio systems. While they can confer a change, it pales in comparison to what is done with power and signal paths. (I am not interested in arguing my advice with anyone here. If you disagree, great, do things your way.)
A tangential point; most people randomly pick a position for a speaker system. With casters, you can experiment MUCH more with it, and most likely find a far better result. I would never put a big speaker on a separate, mobile stand, as it is far less stable, too. Talk about introducing unwanted vibrations! Casters would be far better in that regard.
In real world system building you make the changes necessary to live with the system - or else you won't use the system as much, and or have trouble with the spouse.
People may insist that spikes are necessary to elicit the best performance. While that may be true, I have not found it to be the case. I have used many speakers that have spikes, and frankly, the speakers that have had casters performed better with casters, largely due to the elevation of the speaker raising the sound stage. In addition, there are literally dozens of potential advancements to systems, and almost never are all of them employed. Imo, spikes are among the least important of the changes that can be made to audio systems. While they can confer a change, it pales in comparison to what is done with power and signal paths. (I am not interested in arguing my advice with anyone here. If you disagree, great, do things your way.)
A tangential point; most people randomly pick a position for a speaker system. With casters, you can experiment MUCH more with it, and most likely find a far better result. I would never put a big speaker on a separate, mobile stand, as it is far less stable, too. Talk about introducing unwanted vibrations! Casters would be far better in that regard.
In real world system building you make the changes necessary to live with the system - or else you won't use the system as much, and or have trouble with the spouse.