I already have your 1.5" front collars. I don't do a lot of off-roading, but i'm looking for something to help reduce the sag while towing a 5000# boat (500# tongue weight). What's my best option here?
If you do any off roading, we don't recommend an Air Bag Kit.
We have a few options. Our stage 3 is the most common. If you daily drive with weight (a few hundred pounds) in the bed, go with the Deaver +3. If you daily drive with an empty bed, go with the Deaver +2. This will help immensely with the sagging and ride quality. The air bumps will absorb the impacts when towing and off roading. The Fox 2.5 Air Bumps can also be used to help increase the towing capacity, but I wouldn't worry about that unless you have a really high tongue weight.