I have a '08 FX4 and whenever I put any weight in the bed or tow it squats pretty bad. Noticed it only has three leafs per side. Wanting to upgrade to something a little beefier, but I don't want to raise the height at all. What are the best options? Any feedback is appreciated.

 

There are other options, but my pick was to put in air bags. You can adjust the pressure from 10psi to 100psi for whatever you're carrying or towing.

Here's some pics:




1800lbs of bark mulch:




Towing boat: