Guys I just don't feel that the above ones are as safe as under the ground. If a Tornado can pick up semi trucks, let alone a heavy one ton truck like a feather. What would one of the above grounds do if a one truck was slammed into one at 200 miles a hour or even 80 miles a hour. Think about it. Would your odds greatly multiply with an above ground hell yea it would and would the odds of something demolishing it, probably not. But still, below ground is safer.
But as I get older the ease of use of an above ground is looking more and more useful.
There's also no way for a tornado to get underneath the above ground, it's bolted down. The rigs and pickups you're talking about arent bolted to the ground and have ample clearance for a tornado to be able to get wind underneath it.