I just purchased my 201 F150 XLT Screw 4.6 3v and I would like to add helper springs. I am in the flooring business and sometimes I put a heavy load on my trailer such as today when I picked up 2 yards of sand.

So which Helper Springs do you guys recommend that will not change how my truck rides empty/unloaded.

 

My personal preference is air bags. I installed them in my 98 Durango and loved them immediately. Cheap, and really flexible. As in you can have either no air in them and maintain a soft smooth ride or 120psi and eliminate all the sag and keep driving.

I didn't use an onboard compressor due to really cold weather here but it's easy enough either way.

Keep in mind that regardless of the suspension help the payload capacity DOES NOT CHANGE. It just eliminates the sag and produces a better ride.

 

x2 on the air bags. Won't ruin the ride when empty if deflated.
I plan on installing a set on my '09 screw to help with towing my 30' toyhauler.