No, its not what you thought. My Merc 410 chassis was sagging a bit at the rear what with all the stuff in the garage and when I hooked my buggy trailer on. So having recovered from the initial shock of the price of an air suspension kit, which did NOT include gauges and pump at almost £600 without labour I decided to attack the leaf springs. Having taken them off and delivered them too a company in the Midlands who have re tensioned them and put in an extra leaf complete with new extended U bolts and painted like new, am well pleased with the result and the old girl sits up as perky as she did when new. All for the princely sum of £150. The problem with motorhomes is that unlike the commercial vehicle chassis that they are built on, they are always loaded and this weakens the springs over time. The company I used has been trading for many years and not only can I recommend them, but they have promised me a funster discount. So if any of you are thinking of lifting your rear ends send me a PM and I will give you the contact no.