Anyone interested in doing the tailgate seal on these trucks and having problems getting the water to stay out, this may be the thing you are looking for.. I purchased a seal from amazon, https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1, and they had this nice little set of instructions to install.. Here is the install site, I used 2016 F150 instructions since our tailgates are similar, https://tailgateseal.com/FordF150-2016.html...

After I finished and closed up the tailgate, it looks pretty good.. Will be watching when it rains again.. I did not do all of the places it said to seal it as I have a bed rug installed as well