Many storms that generate tornadoes are accompanied by severe lighting. Laying on the ground in a stand of trees is not suggested, something in the electrical world known as touch and step potential. Here is a page from a long article that has more info.
https://science.howstuffworks.com/na...lightning8.htm
I full time in Hackberry, LA for work, and where I am located, there is absolutely nothing I can do to protect myself in a tornado. I have seriously studied the terrain and surrounding area. Even jumping in the boat canal behind my camp site is too dangerous with all of the metal, glass, other debris, and possible dangerous wildlife (alligators included). My only chance is to get enough warning to try to get out in the MH and dodge it.