Yep, the story goes that when Bob Tiffin was just starting to build RV's in the 60's, he was comtemplating a variety of different brand names. He asked his wife, Judy for her opinion. After some thought, Judy came up with "Allegro". One reason being the name Allegro would put them first in many search documents (IE the phone book) , and the term Allegro as applied to music indicates "a tempo marking indicate to play fast, quickly and bright". She liked the connotation, and so did Bob. Thus the Allegro brand RV was officially born.
And it's true, I asked him in person at a rally in Texas last year!