direction, duration, terrain...
No stock answer. If someone says "67mph" then there are conditions which would cause it to tip at 58mph.
Straightline winds came thru the St Vrain campground a few years ago. One 5th wheel was toppled, a few were twisted around, and a few were untouched.
All campers were in the same loop.
...unhitched & jacked up off ground
As pconroy said, no Stock Answer. I Received this link from someone, not sure who, but it shows that your question is hard to answer. This is a 51,000 lb Class A.
https://mnmgo.com/our-motorhome-was-destroyed/
Last Wednesday in San Leon, TX, a storm passed through about 3:30am. It woke me up rocking me in the bed. I'm normally a sound sleeper but almost rolling side to side woke me. Thought it would be good to get dressed. While doing No. 1, the water in the toilet was sloshing high enough to almost spill out. Glad it did not. Then, grabbed the iPad and checked the radar. Red all around. Did not get the wind speed I was too busy dealing with other items. I do know it was well past my previous 55 plus experience.