Graystone coil spring assisters

[Stuartggray]

Has anyone had experience of these? They are rubber ring things that fit into the gap of the rear springs of a car.
I was pointed at them by a friend when I remarked that my caravan frame seemed to ground just behind the tow hitch of some speed bumps and cushions in my estate.
My ride height looks OK on my Volvo V70, it is running on 15" steels. The nose weight of the caravan is under the maximum allowed and the tow ball is within the recommended height.
Something that raised the rear of the car by a few millimetres would suffice. Would the Graystone coil spring assisters do this?
Also would it raise the car when not towing? I quite like the low lean look it has, and don't really want to change that.

[Stuartggray]

Cheers Ray - I may take a punt and fit them.

[Stuartggray]

Bill said:

How tired are your springs? I know you like the low look, but I'm fairly sure Volvo didn't design it like that

The springs seem to be Ok. Ride height of 400mm looks Ok to the eye. I can't find info online about the correct ride height. Putting the caravan on the towbar doesn't make it sink much at all, although I've never measured it (70kgs). Me standing on the towbar makes it sink by 10mm. That's about 88 kgs. I've forgotten the towball height, but it was well above the minimum required.
Anyone know the correct ride height for a V70 2001 Torslanda on 15" 195/65 tyres?

[Stuartggray]

Well, I fitted them. Perfect. Raised the back of the car just enough to have the caravan A frame and the blade stabiliser clear all the speed bumps I come across. Car has a slightly nose down stance when empty, but I quite like the look. Feels firmer when going over speed bumps empty and solo, just like my old 740 used to.