From my point of view its not so much a question of how much wind the pop up can take in the up position, but opening and closing of the top during wind that you have to be careful with. I had a situation when I was camping by myself where I went around the camper and unhooked the latches, next I opened the door and unlike I normally do I slide back the "fence gate latch" as I called it on the top near the door first before pushing the top up. Well, much to my surprise a wind gust came and popped the whole roof up on its own. I was lucky as there was no damage, but it has caused me to always keep the front slider well open for airflow and be very careful when in windy conditions. I hope this little adventure helps you when operating in the wind. Personally, I avoid windy conditions with the camper the best I can, or I point the front of the camper in the direction of the wind and it seems to handle it fine. Basically, its the only down fall in my opinion of the pop up style camper.
Oh, and on a somewhat funny note. Last weekend I was up on highway 88 and as I was driving east a pop up type camper other that a 4 wheel or ATC was coming west with the top fully popped up. Its not good to say, but it did look kind of funny as it was sort of bouncing up and down. I would have tried to say something, but I was heading uphill and he was gone before I realized what I was looking at.
Have fun and be safe out there.
Darryl