Really? 50 USD each is very inexpensive - I am surprised.
At that sort of price - a full replacement every few years would be practical, when ageing is seen.
I see a really cool possibility with the air springs, (with some kind of enhanced controller):
Lift(reduce air) and push down(more air) opposite corners when you are fully articulated - stuffed, plus some bias/tilt to one side.
To prevent possibility of roll-over, and enhancing traction on the most dropped corner wheels, by pushing down some,
Where those coil springs normally would be fully extended and hanging. - What the Slinky springs are supposed to be better for.
And how about this - dynamic side to side anti-sway control on road - puff some air into both outside springs when cornering?
I looked over everything about these on the Continental site - unfortunately - they give practically no technical information.