I was watching the thread and did not find anyone to tell us the right solution.  I think, most of us who would like to have a strut installed, would like to know which one to get, where, and how to install.
The 2x6 solution of Friday folly was good to read but did not bring us closer.
The European models have these struts on some tops, especially on the newer Eurovan campers or some other variations of pop tops.  
Probably there is no one who knows.  I would understand that.
Zoltan