I want to thank everyone for their posts. I got a lot of information and inspiration. I took a 6x12, single axle, Cargo Craft trailer with a drop down ramp and converted it. It was a fun project. I wanted comfort, but I have to use the trailer as a cargo trailer 3-4 times a year. So the back kitchen needed to be removable. I got my wish. The first trip was wonderful. My wife and I started north of Tyler Tx, and ended up in Eureka Springs AR. The trailer was very comfortable and preformed perfectly.
Again, thanks for all the info here!