The speed limiter is because the truck tires are only rated for 105 MPH. or 170 KPH. I learned this from a GM mechanic a few years back when my 2011 F150 would cut out at 160 KPH. I guess lawyers have gotten involved as well.
I just wired in a dash camera and used Add-A-Circuit from Amazon. Use CCT 35 on the passenger side kick plate. I would suggest connecting your camera to that cct, it is the run/start for the 400 w converter. Run the wire behind the glove box and out by the 12 volt outlet on the dash. There is...
Could the bracket on the tailgate be upside down. Can it be move to the top of the pivot point verses the bottom? The would reverse how the shock works.
EDIT: Just watched a Youtub video, the lower end of the shock is to be down when the tailgate is closed, and comes up when opening.