Hey Brian,
I’m an avid follower of Junior Luciano who has many hours in the rig, and he’s posted a few photos on his Instagram of his rain and snow builds. For the most part it looks like a full cover, loose, light trash bag is the way to go for the rain. I’ve added a photo screen cap I took of his Instagram.
He’s got a video of him operating with it as well. https://www.instagram.com/p/CBLD-YhAqJG/?igshid=10e2h02av5wo0
I’m not sure if it’s the best solution, but it’s all I’ve seen so far.
Good Luck!
- N. Kramer - Local 600 1st AC