Hi Keith.
We used to have those containers, filled with water wrapped around the legs, but the real strong winds always used to move it.
This year we have opted for screwing the legs to the patio, using ropes to the grass at the front, and securing the back to the wall with hooks in the wall and ty-wraped to the gazebo. It has not given us any issues this year (famous last words ). Although some of the roof members are looking a bit bent.
Derek.