Can be problematic in wind but because of the portability of the dish I tend to position the dish on a side of the caravan which protects it from the wind or I erect a wind break around it.
Cheers for now
Base filled with water. Could use sand but when towing a caravan the emphasis is keeping the payload low.
I have also used a giant staple which can be secured over the feed arm and pushed into the ground to stop the dish being blown off direction in very strong winds.
Cheers for now.