On my 2507 Dodge 2500 I needed something to smooth out the bounce of my 7.5 mile fifth wheel. These "air springs" did it. Previous reviews I've read said to add air when you get bounce. I was at 50psi, still had rebound, I was going to 60, 70, 80 and still had rebound. Added air up to 90psi and wow the bounce was gone and the powered ride settled down instantly! I was amazed at how well these airbags improved the ride. I didn't add a compressor initially, but I found it difficult to get the…