I recently tested a custom built Bigfoot cart, and I'm addicted to it, this cart is the Cadillac of carts. It is a beautiful piece of equipment, and is very functional. Doug Solis at BigFoot can custom make a cart to your personal specifications. The unit I tested was built to house a Mac Pro on it's lower slide out tray, and can handle rack 2U drives and RAIDs as well as a rack mount UPS. It's outfitted with a side arm that holds perfectly a 15" or 17" MacBook Pro in the right position, and solid top platform for monitor and a flip up side door (on the other side) that holds most everything else. If it gets a bit hot inside with all your gear humming away, just pop off the sides for complete cool ventilation.
One of the BIG deals about this cart are the BIG WHEELS. They glide over rough surfaces without jarring your precious computers and hard drives. Bigfoot also sits tall, so you will need a tall directors chair to comfortably work your keyboard. So whether you're on a still photo shoot or a feature film, you will be looking good and organized with this awesome custom cart.