Great choice on the hitch! You will love it.
I used the standard 1/4" plate on mine but found that it was not easy to tell when the pressure was off the hitch when raising the RV to pull the truck out.
So I bought the 1/8" plate from Hensley. It is expensive but it is easier to see the gap now.
The reason for this is because the B&W has thick 1" jaws compared to other hitches.
Mine did not fit tight to the kingpin so I laid the disk on the concrete and took a hammer and tapped the inner circle edges so it made the inside diameter slightly smaller so it fit nicely.
I know some will say they have no problem telling when to stop. I am just relaying my experience.
BTW the bottom of a 5 gallon bucket works perfect and the center raised ring is the perfect diameter to cut out to fit the kingpin. I have one as a backup.