Hi Frank,
At the moment I am a travelling virgin compared to most here, but am aiming for a couple of trips to North Africa either with a friend or my family (wife + 3 kids) using a Toyota Land Cruiser.
Travelling with the friend, I would just go for a compact dual burner gas stove that would go on a fold up table, with cuttlery, plates, cooking kit, etc all stashed away in a draw unit in the back of the LC.
For a family trip I would take a trailer along as well which I would build myself to incorporate kitchen facilities although there are a number of companies that sell similar things.
At the end of the day the design really hinges on your type of vehicle.
With something like a LR with barn style doors in the back, I have seen some people put in fold down gas cookers (folding down from the door), but you can't do this with an LC with the horizontally split rear.
Also with a diesel vehicle I would rather go for a gas cooker as opposed a petrol one, although with a petrol vehicle a petrol cooker would make more sense.
One thing that I have seen that looked inpressive was a suitcase style box used for storing cuttlery, cooking utensils, etc that you opened up and put on it's end and was a cross between a picnic hamper/kitchen unit. Something like that would be very handy and easy to setup, but the dimensions would again need to tie in with your vehicle.
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Cheers,
Julian
Euro Landcruiser Owners Club
http://www.landcruisers.info/lists/