To solve all problems..........Throw money at it...
And that applies to keeping a bunch of keyboards stable and playable with the added bonus of moveable.
I am using mine in a studio setting but need to move it occasionally to access a storage cupboard and it works great.
It is very light weight considering its size and should be no problem carting to gigs,
( I am not saying you should actually cart all your keyboards on the stand down the road to your local venue, that would not be good )
How all the fasteners last over time is a lot down to how you treat them. (Never let a drummer tighten up the bolts)
I like the design of this rack, I have had the A frame style before and this is much more stable and you can place it closer to a wall.
Expensive but works.