The attitude of not leaving does not make sense. You have the warning and the ability to go.
If you must stay find an open field, somewhere that doesn't have material that can blow against you, including a rush of water.
Go to the local hardware and purchase 8 of the large screw in anchors and enough chain to attach each of your four corners with chain over the axle, at each corner, connect each of two anchors spaced at that corner of your RV.
Your windows may blow out and you may not be covered by insurance.
If you are in the path and you stay
you are foolish.
JIM