i have barn doors rather have tailgate,to the guy with rust problem ,,i use a greese needle to grease my barn doors,had to replace hinge pins,,,doors were rusted out so replaced with new doors and pins,dont let the 3 bolts on hinge inside fool ya,they do nothing,hinge is welded to frame,got doors from junk yard freaked out,they just opened door and cut them off with saw..thought i needed hinge,cussed the guy out on phone,da had to back track and say i was sorry,hope this helps, mich salt is a killer.i5 years in salt in detroit.