I use just a regular pet carrier.
The main vet branch has a car park right outside so that's not so bad but the little branch near me is a 500 metre walk from the car park. Not far, but when you're carrying over 10kg's of rabbit and ginormous plastic box, it's a long old way! :lol:
I normally fall through the door too, and then normally simultanoiusly trip over a dog of some sort. I'm very graceful! :roll::lol: