Well, if the Big Bad Wolf is going to be huffing & puffing and blowing your shelter down, some drastic measures will be needed. Any portable shelter option is likely to get damaged, but you can take some steps, like drilling fence-post holes, filling them with concrete and setting ring-bolts in the cement, then anchoring to the bolts.
Another approach is to tie the shelter down to the trailer itself. just remember to UNTIE it when you hitch on or you will pull the shelter down.
And NO, we will NOT discuss how I know this.......