A few economical tips I did myself,,,,I have a 4 ft Fortec Star with motor on my roof,,,,,,
In the area I live we have very strong wind storms sometimes,,,,,,I used some steel plates that I placed from underneath my false roof,,,,,,and also on the roof itself,,,I placed some hooks I screwed on and bolted down underneath with steel plates,,,and installed some tensor wires,,,,,works beautiful and is quite cheap to do,,,,,,,My set up has not moved at all even in 65 mile X hour winds !!!!
Good luck