F150: max payload package or airbags?

I own a 2013 F150 that I really like but want a firmer suspension for hauling and trailer pulling. I might upgrade this truck but really need a new vehicle anyway. I have not been able to get a promise date on the build from Ford so far but waiting is not a big issue. The main issue is that I would like some safety features like adaptive cruise control and backup sensors(and a bunch of comfort items) that are not available with max payload package. While I really like the higher rated payload I am getting more and more tempted to just specify the long bed and heavy duty tires from the max payload package, then add supplemental air springs and maybe heavy duty shocks. It seems that the only thing I would lose is the heavy duty axle. I don't plan to carry heavy loads frequently, I mainly want the stability for trailer pulling (I do miss my F250 but really want a smoother ride and better fuel economy). The axle with max tow package is rated to tow just as much as the max payload axle and I am not clear what else I would lose other than springs. Unless max payload gets a lot bigger brakes or bigger wheel bearings I don't know what the improvement would be. I was thinking or adding air springs regardless of which truck I get just to keep truck level when loaded.

Does anyone know of something from the max payload package that I might really miss or should I just skip it? I do know that I really want the longer bed.