[BB_TX]

Don't know that there are any hard fast numbers of how much wind it can withstand without rolling over. If I were staying in place, I would get some of the screw type anchors, screw them into the ground as far as possible, and strap them securely to the frame. More the better.
But I would also make sure there were no trees that could be blown over on top of it. Falling trees and blowing debris may be the biggest concern. Not sure what you can do about the windows. Can't really nail plywood over them.
Good luck.

Edit: I was speaking of the mobile home type anchors, not awning type anchors.
They keep slowly moving the projected path of the hurricane farther off the coast. But a little inconvenience of moving farther inland now could save a huge inconvenience later of a damaged trailer.