I found this in a post that Voices of East Anglia did with a couple Topper photos from my gallery http://justacarguy.blogspot.com/2007/01/1960s-harley-scooter-and-trail-bike.html
but V of EA also found this Topper with a sidecar... I've never seen that before!
http://www.voicesofeastanglia.com/2012/04/mocker-mobile-harley-davidson-scooter.html
above ad found on http://aacalibrary.tumblr.com/