What's the worst weather you've had to service porta potties in?

Last October, I pulled up to a construction site in a sideways downpour with 40 mph gusts. The mud was ankle-deep, and my vacuum truck slid trying to get within hose range of the cluster. Every standard unit had water sloshing in the bottom from the door not sealing tight. I had to hold the service hatch open with one hand while wrestling the hose with the other, getting soaked. The wind kept trying to slam the door on me. That day, I learned why we always carry extra staking and tie-downs in the truck. What's the worst weather you've had to service porta potties in? Any tricks for high winds or deep mud?