[4] Casey built two mobile armored trucks called Tornado Intercept Vehicles (TIV and TIV2) to film very near to from inside the tornadoes he chases, sometimes with atmospheric scientist Joshua Wurman's Center for Severe Weather Research and the Doppler on Wheels radar trucks (DOW 2-DOW 7).

Sean began concept of the TIV after having to use rented minivans to storm chase, and being unable to get up close to a tornado.

[8] Construction began on TIV2 in September 2007 with help from Great Plains Technology Center in Lawton, Oklahoma[9] after Sean realized he needed to upgrade his vehicle.

The original TIV has 2-wheel drive and extremely low ground clearance that would cause it to get stuck on unpaved roads.

It is powered by a 6.7-liter Cummins turbodiesel engine, modified with propane and water injection to produce 625 horsepower.