I've run them in and out a couple of times, just to exercise them. No problems so far.
That sounds like a deal on the vent covers. Our dealer installed ours when we picked it up. We bought two and he gave us one, not bad for the MaxAir with the quick pins on them. Hopefully they will get you back in business soon.
2015 Pinnacle 36FBTS
2015 F250 SD Platinum 4x4 - 6.7L PSD :
Titan 50 Gal. Fuel Tank
Slotted and Dimpled Brake Rotors
Air Lift LoadLifter 5000 Ultimate Airbags with WirelessAIR Controller