I bought a Timbren system for my 2005 Dodge Ram 3500. I tow a 32 foot long medical trailer on freeways and country roads throughout the western 11 states during wildfire season. . This trailer has an extremely high tongue weight and that would limit my torsion bars. Timbren Springs were easy to install and took less than 30 minutes. My truck now squats less than 2 inches without the use of balance bars. They also do not interfere with the movement of vehicles when empty. I recommend them to anyone involved in towing.