TrevorB

I have a 2007 f150 reg cab long box 2x4 and i recently bought a Piece of farm equipment (bale wrapper) its total weight is 5500Ibs tongue weight is 950Ibs it brings my f150 down quite a bit theres about 4inchs to the bumper stops.
I dont no if i should just put add a leaf in or Timbren or Super springs I dont really want to install air bags.

What should i do ?

SkiSmuggs

SuperSprings are a good choice as they have two settings and are easy to install. Roadmaster Active Suspension (RAS) is another good choice with adjust ability.

smokeywren

Why? If it's my pickup and I don't plan to trade it in for at least a year or so, I'm gonna install RideRite air springs in the rear suspension. Because it's an older truck, I wouldn't spend the big bucks to install the air compressor and the other nice-to-have parts of the RideRite system, but the air bags with a manual air adjustment system would get the job done.

Boulevard

A long leaf Add-a-Leaf would be my first choice and you can get those made up at any quality spring shop. The Super Springs are also slick in that you can do it yourself and get the exact same results.

08f150fromNH

I have Timbrens and am happy towing or bed loaded up.
RAS or Super springs I think would give positive results.

Timbrens were inexpensive and doesn't affect unloaded ride quality like an
add-a-leaf will. Thats what made up my mind.