According to a brochure I found on E-bay, the Vagabond Coach Mfg. Co. of New Hudson Michigan built a Single Wheel trailer in the midst of building one of the most collectible travel trailers today. They started manufacturing travel trailers in 1931. The Single Wheel looks to have a uniquely designed trailer box. The only info I have, thus far on this trailer is this brochure which is far to small to actually read.