Funny that I bumped into this thread as I recently posted my experience installing a Will Wood hitch and utility trailer on Rennlist. Bottom line is it works great. As others here have said, the tongue weight is rated at 60 pounds. I'm not sure a small foldaway camper would be that light but I just don't know.
http://forums.rennlist.com/rennforums/boxster-and-boxster-s-986-forum/517105-diy-towing-will-wood-hitch-and-utility-trailer.html