I'm not sure I understand what exactly is referred to by the term "high gravity" but I do know that there are some beer-like things that I can now purchase in my hometown since they allowed wine to be sold here (things I previously had to drive to a liquor store in another town to get). For instance:
Lindemans Framboise (a raspberry lambic from Belgium) - is that "high gravity"
??? In general, are these secondary fermentation type beers considered "high gravity"
???
btw: mix a little Framboise into a tart cider . . . mmmmmm!