I dont know how much yours are flexing, but i did notice on pdi that mine had a small ammount of give around the vent only.......i chalked it up to the vent and its associated hole in the floor?...it was not an ammount of flex that would make me think structural issue...kinda how the walls where the thermostat is mounted flex and bend when i push buttons on the a/c.......i dont like it, but i understand there has to be a balance between weight,cost, and FUNCTIONAL structural rigidity....but if yours seems excessive i would def get it looked at.
2015 F350 Platinum Fx4 6.7 Diesel Dually. B&W turnover, B&W Companion, air bags and wireless controller.
2015 Heartland Road Warrior 420 Rt
2012 f250 Fx4 6.7 Diesel crew cab tinted n tuned
2012 lacrosse 318bhs touring- sold