Originally Posted by BCMIF150
I guess I half to ask...Would you drive with your driver door open going down the road? I'm pretty sure the manual doesn't say to close it either?? Owners manuals can't cover everything. You just have to use common sense on some things in life.
Seriously? They sell bed extenders as an option for f150's. If they didn't want you leaving the tailgate open, they wouldn't sell them.
Common sense is that a common function of a pickup truck (i.e. driving around with the tailgate down) wouldn't fail spectacularly.