Molt Taylor strikes again! I don't know if any others were built. His Coot amphibian was more popular. Flying car concept started in the 1920s and has been on the fringe ever since.
I think trailering the wings is a sound idea. It allows a more normal sized aircraft. The bit of occasional fuss to remove the wings is a fair trade if the alternative is waiting two days for the flying weather to improve while cross country flying.Just looking at popular Mechanics June 1961 p 71 and found a this