Quoted from playernumber4:I would be afraid of a loose tarp scratching up the edges of the cabinet as it flaps in the breeze at 70 mph. And it would tear up the tarp too as it flaps against the corners of the game. Ideally such a tarp could be wrapped over with shrink wrap and provide excellent protection.
You are just going to have to buck up for a roll of shrink wrap OP and not have to worry about a precious game getting water damage. A roll covers way more than one game anyhow.
I'm only planning to use a cover for a quick trip on a dolly to my Ford Escape, so it won't be going 70 mph until it's safely inside the vehicle. Instead of bucking up for a roll of wrap, some of these posts have led me to look for and find what I think I'm looking for, 5 heavyweight plastic storage bags that look big enough for $6.95: https://www.unoclean.com/Warp-Bros-Coverall-Plastic-Storage-Bags-618195.aspx
Thanks for all the ideas everyone, this helped me hone in on what I think is exactly what I'm looking for. I wouldn't want to use these for hauling a pin in an open trailer or pick-up truck, but I knew there had to be something cheaper, simpler, and more compact than the wrap-rolling method just to keep the pin dry while just loading it.
And nothing against all the wrap-rollers. Your method is far superior for multiple pins or open vehicles.
Thanks again for all the help!