As Rustic Eagle mentioned there are toooooo many variables.
My thoughts about a pop-up camper
would be with any major storm approaching, head for some protected area, (brick bath-house, office...)
As for a TT:
The primary consideration would be the direction of the wind hitting a TT. If the TT had its slide out, that alters the TT's center of balance. You now have 500+ pounds hanging over the end of the TT on the drivers side (in our case). If the wind was hitting the TT on the curb side, needless to say that the amount of wind needed to overturn the TT would be less than if the slide was not out at the time. From the back or front the TT would be able to withstand a higher wind speed.
When we first got our TT we were dry-camping in western Nebraska (open area) and there were tornados forecasted all around us and they did touch down around us. One of the local's that was out every weekend said that we should pull in our slides for high winds. I thought that that was some good information, so I contacted JAYCO to see what they had to say and they agreed that the slides should be pulled in in any high wind storms. Have been doing that ever since.
When we left the next day to continue our trip to Colorado, along the highway there were Semi's overturned in the ditches along the interstate. Lucky us!
As for any storms with an updraft all bets are off.
RVing with SOLAR