Hymer B584 rear Air assist

Any 584 owners with a Fiat chassis fitted air assist bags to the rear suspension, I was wondering if it would be worth doing or not. I noticed the bump stop ( which are not bump stops but
progressive rubber things! ) are starting to degrade on one side.

 

If the rear suspension is worn no point in trying to mask it by fitting air assist much better and safer to replace the springs & shockers then fit air assist if you still think the van needs it.