I have a 2008 Sedona that I have installed a trailer hitch on for light towing. The hitch lowers the ground clearance and I often scrape leaving parking lots and drive thru's. I keep a lot of tools and equipment for work in the van also which adds to rear weight. What are my options to raise the rear end? I have looked at air shocks, air bags, and springs would like to hear your experiences on what worked for you. Thanks for your thoughts in advance!