Cool, so I can jump in here, I just got a 2016 DRW F350 to tow my 390MBL with a hitch weight of 2,580lbs empty...so as you can see on my signature I had a '10 F250 with the Firestone Airbags...it was a good combination plus I was able to keep the truck leveled which was good deal. I needed to put 85 psi of air to bring the almost 4" of sag back up! I think the bags are rated at 100 psi if not mistaken. I thought I was too close to the max and when bumps and dip, specially dips, came up I could feel the trunk oscillate a lot and felt the bags were been put thru a lot of stress, specially at 60-65mph. So when I decided to upgrade to the F350, again I knew Fords have a tendency to sag no matter which model it is, so I wanted to use the airbags again. But then I found out about the Timbrens and read some of the reviews from fellow campers and kind of liked the idea of not worrying about a blown airbag taking out a brake line, since they do go very close to the max air pressure.
So coming up on my next 6 hour trip I went ahead and ordered a set....now mind that there is really no savings between a basic airbag set up and the Timbrens so price wasn't a determining factor. The Timbrens were extremely easy to install and looked the part! So how they perform? They do what they are suppose to do...they prevent the sag and help the uncontrolled bounce when hitting a dip or hard bumps. So am I completely satisfied? Yes and no...more than to be a little safer, I hate the aesthetics of a sagged down truck, so with the Timbrens the truck still sags about 2". Driving wise, when unloaded I can feel the difference, since the truck does hit the Timbrens hard since I have about 3/4" space. Now I didnt installed the spacer which says if your truck has the peg style perch, the spacer will touch it and seat in it, hence alleviating the sudden bump feel. That did not occur with the air bags since they are always in contact with the axle and always running around 5-10psi.
Would I buy them again? Probably not, and would probably go back to the air bags but not because they dont do the job, but because I would like the option to actually completely level out the truck when towing. But in that case, I would have to buy a completely equipped air system and not run around with an portable tank to fill the bags.
This pic is with the Timbrens
Actual pic of Timbrens installed without the 1/2" spacer, you can see that they dont touch the peg and the instructions clearly state to use the spacer and that the Timbrens will rest on the peg...so I will install the spacer and give it one more try.
PS-the signature pic is the F250 with 60psi on the airbags...lots of sag.