The newest line of Hellwig's patented helper suspension is the "Pro Series" helper springs. These are the next generation of helper springs designed to offer "load assist" and Sway Control" in an easy to install package.
"Silent Ride" models also include poly stops to eliminate noise and friction.
Click Here to View Installation Instructions
Installed these helper springs on my 2014 f150 super crew and was overall pretty happy with the product. I tow a gooseneck horse trailer and the truck handles it great just wanted a little help in the rear and it definitely did that. Install was fairly simple the only hard part was trying to make sure the springs were placed and spaced the same on each side and that took a few try's but nothing too hard. I did have a little issue with the billing on the springs but sdtrucksprings was right on too of things to get it figured out. Overall very satisfied with hellwig and sdtrucksprings on another great purchase from you guys. Keep up the good work and great customer service.