These vans were built with soft springs so they ride nice: but once you add weight from towing or wheel chair ramps they sag. The air shocks add up to 1,000 lbs of additional load capacity: allowing you to level out the vehicle when loaded. Here are 2 videos that one of our customers posted on you tube. https://youtu.be/mesbRfulfeY and https://youtu.be/f4YBuqpswTM. We need your original shocks to work from as we reuse you upper mount and lower sleeve. 5 year warranty. PART # = P4485. CALL TO ORDER = 970-513-8283.