Bag carts seem to be getting pretty common. What I mean by a bag cart is an optimized way for mixers to transport and operate their gear. You'll find some good examples, like the one from Malcolm Davies to the left, over on JWSound. I've used a sort of dolly setup for the past 5 years. It's a fold-up, stainless-steel dolly that collapses into a small, portable square. I added some PVC 3-ways cut in half (the long side) to attach some 1ft. long sprinkler PVC for shelves. I can put a Pelican on the bottom, load it up with whatever I need and tow it all across a hospital without ever having to break it down. The Petrol handle slips over the cart to hold it in place and I can set it up or break it down very quickly. If you'd like more details or instructions, just comment below and I might be get around to creating an Instructable.