I belong to a cooking club where I sometimes bring lots of (already assembled) appetizers. I would like to get something where I can stack trays so that I don't have to stick each one into a separate carrying box. Catering suppliers seem to focus on food transport systems that use pans (that can be set up at a buffet) and keep food warm. They are heavy and expensive.
A google search came up with lots of patents for food tray carrying systems... but I couldn't find any actual products to buy. I see carts... but I'm looking for something small and portable.