Bob-
I have an extended pin on my 5er, so I can back up to it with the tailgate down. So far, I have just left the stock gate on. I looked at the prices of the gates from Camping World, etc. and have decided to build my own this winter. Figured this would be a good winter project.
We have a Mig welder in the shop now and are looking at a Tig. Building one out of aluminum is not out of the question. I'm a "fair" welder, but my partner in the shop is an ace with one. I am retired from a regular job and the shop is pretty much a hobby for me.
Don't know if you have access to welder or materials, but if you do you might consider building one?
Dave