Originally Posted by brycesteiner
However, when I got back, unhooked, etc. I noticed the fifth wheel hitch receiver plate looked like it might not be perfectly flat anymore. I believe it was before I started but wouldn't swear to it.
The plate on the hitch that receives the 5er king pin can flex up and down.
When hooking up I always try to have the pinbox about 1/4 inch ABOVE the rear of hitch's saddle, and have found this to work best. The pinbox will then contact the saddle about 1/3 of the way from back to front. It will still ride up the saddle somewhat, but with less friction.
Do a google search for some videos on how to hook up a 5er.