Those outlets are typically called "Speed Boxes" or "Wirecon Boxes". They are about as cheap as you can get, and they are actually finding their way into structured and residential homes.
Here is an installation guide:
http://www.hubbell-wirecon.com/liter...ationGuide.pdf
While there is a special crimp tool that is designed to work with these boxes, I could never find one on-line. But the installation guide does state you can use a pair of Channel Lock pliers or C-Clamp and a piece of cardboard to protect the plastic front cover from being marred.
And I have to provide an editorial comment. As I have come from the boating world, I am very familiar with electrical wiring practices in boats, which believe it or not, are Federal Law (USCG regulations). The USCG requires minimum standards for boat wiring for safety.
In a boat, you must use stranded wiring as due to the vibrations involved with operating the boat, solid wiring can easily break. So when we bought our coach, I was amazed that it had solid wiring all over. I have to believe some of the same vibration issues exist in a RV that exist in a boat.
However, if you should have a wiring problem in a boat, you could set fire to it 100 miles from shore - which would be a bad thing. On the other hand, should you have a fire in a RV, then you can just pull off to the side of the road and jump out.
So perhaps it's the level of risk that determines whether or not solid wiring can be used.