If you are serious about cooking meals for a large group I highly suggest you look at this guy:
http://www.walmart.com/ip/Half-Time-...Black/16518202
Of course you do need 110 to run it but it is a good microwave and convection oven in one. I have baked pies, cakes, full meals, with it. The 2x means it too, you can use the convection oven and microwave together and it cuts the time nearly in half. It will sit on the counter as well as on the outside on a table (when your home as someone else may like it while your gone). I make a lot of meals at home, freeze and then put them in a cooler with ice. At the end of the week the last of it will be cold but not frozen which is fine.
I also use a slow cooker (not quite the same as a crockpot) and will start a meal in the morning, do my touristy thing and come back to a terrific meal!
I do not pack all my meals. I will pick up fresh meat or salad stuff while I am a tourist and take back to grill, or put in oven, etc.
Dave