OP here are the odds.
You are traveling thousands and thousands and thousands of miles in your RV to get to where you are going. About 100 people are killed on the US hiway system each and every DAY.
In the US about 50 to 60 people are killed by tornado's every YEAR. (Or about 1 a week average.)
IOW's about twice as many people are killed every day in auto accidents as apposed to half as many that are killed every year from tornado's.
The tornado chaser people have a VERY hard time even finding one and filming it let alone being killed by it.
The odds say you are worried about the wrong thing..........by a LOT!