I run a B&W mainly because I didn't want rails in the bed, and I'm quite happy with it (and they do offer models for flat beds).
Next time, though, I will spring for one of the air ride jobs.
Dodge Ram dually laramie 4x4 w/jake, B&W, Brakesmart.
Kit Patio Hauler 394F toyhauler 5th wheel
Camo 680 Rincon, Green 500 Foreman, Blk twincam Roadking