Good point about the tarp. I put a tarp down in my hatchback. Forgot to mention that.Yep, I moved my 10 birds in a crate like that.....only a 40 minute trip tho.
Flat floor of van helped a lot.
Putting tarp down first would be good.
I ought to get a crate that size in case we need to evacuate. I could fit all on mine in one like that easy. I might build ones that aren't so tall, though, so I can stack them.
Also forgot: Researching evacuating chickens, I've seen examples of folks using laundry baskets with towels over them and plastic totes with lots of holes. And one of those pop up baby play pens. Just gotta keep them (and their poop) contained.