I wonder how the BBQ and it's mount will fair after it has been bouncing up and down while on the road traveling.
I have a trailer hitch on the back of my Casita
and had a cargo box in it. A friend drove it a short distance and when he pulled in the driveway I noticed just how much the darn thing oscillates. I took it off and hope to never put it back on.
If you decide to keep in mounted have someone pull it over a bump while you watch from the side. Then decide.
You certainly did a great job!