I hate the plastic crates. We had those with our first poodles, and I'll never get them again except maybe if I needed to ship a dog. They can barely see out of them and I just hate them. I love the huge steel crates we buy our SPs. They are tough and smooth, and have doors on three sides (if needed). I'll go find it for you... (Midwest makes great crates)
This is the crate we use in the house:
Midwest Select triple Door Dog CrateLooks like they makes a folding crate for the car:
Midwest Folding Van CrateAnd what a cute camping version! Lots of openings for air to flow through..
Midwest Canine CamperHelen