When you say convert to a trailer....I presume you mean that you'd tow it ? If so, I'd side with everyone else, in the interest of the car.
Now if you are talking a possible interior conversion that would allow you to drive the vehicle, and allow one person to sleep comfortably, without modifying the exterior...then I think you could accomplish your goal, and still preserve the vehicle..? (like a miniature class-b van camper...that sort of idea...they don't mess with the exterior typically)....:shrug:
It is a very cool looking car you have there. Whatever you do, enjoy it...:thumbsup: