Want to upgrade my rear suspension for towing my twin axle caravan as it seems to be abit low ,does anyone know if you can get updated ones or do them come in different strengths.

 

You migght be able to get stiffer springs, but that would not be comfortable for regular use.

The best thing I have seen for this type of situation is an auxiliary airbag that can be installed inside the rear spring. You pump it up when it comes time to tow and it will keep the back up.

Airlift 1000

I don't see a kit for our cars specifically, but I've seen someone else that pieced something together somewhere. Call around and find out.

 

Audi and towing?

Get a truck.