VIGOR Air Suspension Spring Kit for Ford F-150 2009-2014 - OEM TR2525

This is a really cost effective kit to help alleviate some sag in the rear end from being heavily loaded.
Everything, including the airbags, looks to be a quality kit. There's obviously a little installation involved, so if you're not comfortable with suspension work, don't hesitate to take it to a shop.

One thing I wanted to point out from the manual that I was unaware of:

"Once the air helper springs are installed, it is recommended that the vehicle not be lifted by the frame, as over-extension may occur, resulting in damage to the air helper springs. However, should it become necessary to raise the vehicle by the frame, deflate both air helper springs completely."

So, don't raise it by the frame, leaving the suspension to dangle or you may ruin your air bags. If you do, make sure you COMPLETELY deflate them. Keep this in mind always when working on your truck...it would not be good to be jacking it up by the frame, only to hear "BLAM!" as it blows. Luckily, the manual for this kit is actually pretty good, and you can read it, so problems should be few.

We'll see how long it lasts, but right now it's 5 star. If I see any signs of early failure, I'll report back.