I too HAD the tonno-pro tri-fold on my 250 CCSB and with the trail air pin box, the only time the shock brushes the tri-fold is if I've bled all the air out of the pinbox airbags and the shock is almost laying flat - otherwise works like a champ !
Now, with the new 350 CCSB I just got, it came with a Ford branded Truxport cover. Seems to be a nice cover with a nice touch of the ford logo emblem on top... but not sure which I will keep and sell the other....