FWIW, Bilstein 5100's and Fox 2.0's are valved quite a bit differently... I have bilstein's on my truck and Jeep. They're great "performance handling" shocks, and good if you want to go faster than you should with stock suspension or a mild lift, they help with that goal. That said, the valving is not ideal for washboard or rough road surfaces, IMO, as the high speed valving is too stiff. Fox shocks are pretty much the opposite, as Fox tunes for a nice smooth but controlled ride, but if you push them fast in the rough, there is more risk of bottoming out with limited travel stock suspensions. Until that point, the ride will be smoother though. My experience is that Fox shocks just eat up washboard, and are very comfortable on the highway.
Unfortunately, the Fox 2.0's are expensive, and for my application, they limit droop travel severely compared to every other shock out there. I've heard about leak issues with Fox shocks in the past, but that was 5 years ago, and I would hope that by now they have that under control... For a while there was a rumor that Fox was buying a shock plant, and that they were going to begin offering normal, non-rebuildable shocks with Fox valving at a much better price than the 2.0's... Still haven't seen any of those, but if they come out, I'm ditching the Bilstein's that day...
I will also say that I've had airbags, and I took them off. Mine replaced the jounce bumpers, but didn't have jounce bumpers inside them... Not good. I found that they also made the back of the truck rebound to the point where it would almost hop if I was moving swiftly through something that compressed the rear suspension. I ended up adding a leaf to the pack, and I'm much happier. If you like the way your truck sits with a camper in the bed, I'd say leave it!!
Hmm... I bet your truck is coil rear. Airbags in the coils might work quite a bit better than my bags with leaf springs setup... They did on my Jeep, anyway...
Good luck!!!