Abstract: A method of manufacture of vehicular trailers comprised of: a suspension system (A) slidably attached to a load bearing frame structure (B) enabling said load bearing frame structure (B) to horizontally pass over the vertical axis of said suspension system (A); a means (C) to apply force so as to cause or tend to cause motion toward the source of the force; a rotatable means (D) allowing said load bearing frame structure (B) to roll along a surface; a floating link variable height hitch assembly (E) providing a means for the tongue of the trailer to move vertically and past the horizontal axis of a generic hitch receiver (10d).