I mentioned use of the expression "on the waltz" in Texas. There is a Texas-based 1000 mile motorcycle race every year to some little known spot.
The Cowboy Junkies applied the name Waltz Across America to one of their albums.
I can't trust my German to translate the article by Mareike Schaal "Auf der Walz," to which I gave a link (above)"ZiHi index," but it may have some useful information. You ought to be able to turn up a professor of German who can help.