I recently completed ETT 2021tour 2. Best vacation I've ever had. Two great guides who knew the ropes and were also just fun to hang out with. On days when weather was available they got us into it (four tornadoes and baseball size hail, all up close and personal, but never unsafe). We even had loads of fun on the days the weather didn't cooperate. Great weather briefing every morning. And they knew all manner of amazing places to eat.
Large Ford van with three rows of bench seats for passengers and room behind the last bench for our luggage. Auxiliary power available for charging your stuff. Comfortable, clean, and seemed well maintained. They have bottled water on board and stop occasionally for snacks and bathroom breaks. TIP: I found it helpful to carry a fanny pack with gum and a few snacks in it.