If you are going to get winds of less than 40 knots, don't worry about the stability of the unit too much. I live in a mountain pass, we get wind of 50-60 mph during any winter storm, so that happens at least 20 times per year. I don't even worry about the MH, it is normally up on the jacks, with most of the weight off the tires. (The MH is parked pointing due east, the wind comes in at about 300 degrees). I do not leave the slides out during storms, because of the slidetoppers. Only damage I have ever had from wind is a minor scratch from a tree limb coming down.
Now, we do keep fuel, water and supplies in it. We are in earthquake country. The biggest quake in the last 100 years in Ca was here. (8.2 in 1952)
2005 KSCA 3778 on 04 W22