Last weekend I installed the new rear bumper and fold out tray on the Westfalia. They afre manufactured by Rocky Mountain Westie. I was impressed by the quality of the materials. They are really built to last.
The bumper is modular and installs in five pieces. Pretty easy to install
The swing out tray was a little harder to do. It bolts through the side hatch sopport structure. You have to drill several holes to match a piece on the inside. The inner piece slipped out od my hand once and got jammed down in the channel. It was a difficult thing to get it back in place. Eventually it went together.
The instructions did not include anything on how to install the tray, but it was pretty intuitive. I guess the hardest thing was matching up the latch mechanism, but everything worked out fine.
It took all of Saturday and a couple of hours on Sunday.