I work in construction and heavy equipment operators do it all the time. Its amazing what they can cook.I distinctly remember a magazine article from sixties or early seventies titled "V8 Cookery". The author was placing a whole beef roast on top of the car's intake manifold. I really don't think that ever really became that popular as I've never heard it mentioned since.
Beezer man you and I need to meet up sometime in the middle of Texas. Moonbeam and I do nothing but camp out all around these parts every summer. Sounds like what we do.My wife and I take trips on the bike. We've been to Colorado twice. We don't stay in a campground, we stay in the wilderness. I've got a thing I do: Take foil pan 4 X 8 X 4 and put in whatever meat or fish, frozen vegetables with sliced onions and potatoes. A little salt, pepper and butter. Cover the opening with foil. Set it in the coals for 20-30 minutes. When the food's gone you can toss everything. Nothing to haul in the saddle bag. Go to the next place. While the wife sets up camp I go into town with empty bags and buy more ingredients and another foil pan. National forest access roads are great places to find out of the way places to camp.