I put these in the other day to help with towing. After installing the 2 inch leveling kit up front I found that when towing a heavy load the front end was real light and the back of the truck was sagging like a ford. I haven't towed with these yet but i got 13lbs in each bag the rear of the truck rased about 2 inches and can be raised about 5. The ride is a little ruffer but not bad. The max air pressure is 100lbs on these. They are the air lift brand rated for 5,000lbs.