AUXILIARY REAR SPRINGS Auxiliary rear springs are fitted in or next to the existing main spring. They only come into action when the load reaches a certain load level. The auxiliary spring provides the required extra capacity when this happens. SPORTIVE Is your suspension as sporty as you are? A bike carrier on your car is a heavy load for your car.Improve your driving comfort and have auxiliary springs placed. SAFE ON HOLIDAY The suspension of your car isn't actually made for all your heavy holiday gear. TRAILER This not only puts a strain on your engine. Your car's suspension is also not designed to handle such a heavy load.