I know this is an antique thread, but since it's been revived, I'll play.
I think greenturtle gave the best answer. The main thing I disagree with is the idea you can't use a legless DO (Dutch oven) over coals. I started out with this DO converted from a vintage aluminum DO meant for inside use.
As you can see, I did some modifications to it to use it as a camp oven. It worked flawlessly. I actually had two of them, but since I acquired a good collection of cast iron and aluminum camp ovens later, I sold them both. It hurt though. I loved using the weird-looking things. I do have one of these, a #10 cast aluminum DO made by one of my favorite companies, GSI Outdoors:
It lives in my camper and works great for a multi-purpose kettle that works on the stove or over coals. I use a rack like the one pictured above when it needs legs over coals. I love how that has worked out because the rack is the perfect size to be turned upside down and clip itself to the bottom of the pot for storage. The lid has a rim so I don't have to add one.
I've also used a Lodge Combo Cooker as a Dutch oven. Technically it's not one, but if I could only have one cooking pot in my camper, it would be a Combo Cooker because of that set's versatility. It's basically two frying pans that can be used together to make its own lid. Very nice, and not that expensive. I used some kind of small wire stand I picked up at a garage sale as legs for that. It's not really levitating.
Lots of things can be used to make legs for legless DOs. Some people use crushed aluminum cans. For my smallest DOs, I use candle holders. They have legs, but they're not long enough to clear the lid handles on the pot below if they need to be stacked, so I just have booster seats for them.
I even have a custom made lid stand someone I've never even met made for me as a thank you for helping him learn to use a DO. We were both on a camping forum and I did spend a lot of time helping him, but never expected a gift for it. The lid stand can be used to set the hot lid on while tending to food, which is how I use it with my legless aluminum DO in the camper, or as legs under a pot. Lodge and other companies make lid stands that can be used for legs. Here's the Lodge version.
Dutch oven cooking is a fun, different way to cook. It's easy to learn and a handy skill for preparedness or for camping or even for cooking outside the house in hot weather, so you don't heat up your kitchen. Here are instructions for cooking with DOs using the ring method, which is much simpler than counting coals.
Outdoor Cooking with Dutch Ovens - Lone Star Dutch Oven Society