OK Try again!

Hello everyone. I'm new but my Omega isn't.
It's a 1997 CDX 2.5 automatic.
It's been well looked after, but is showing signs of age.
The biggest problen I have with it is it bottoms out on speed bumps and rough roads.
I had the rear springs replaced some years ago and, shortly after, had some Grayston spring assisters fitted.
This improved it for a while.
Now I need to find a relatively cheap way of raing the ground clearance when laden.
Are rubber coil assisters the answer?
Any advice would be greatly appreciated.

S