[71Dragtruck]

Also if you read 4:10 in section 20 on roll bars to me it reads as the roll bar has to be within 1" of the roof 3" from the top of the helmet above the drivers head, to me that reads on the inside of the cab.

Reading it that way makes sense to me in a safety stand point as in you roll your vehicle on the track and the cab comes to rest on the guard rail and the bar is on the outside, the back of the cab will still crush down on you, with the bar on the inside it holds the back of the cab from crushing inward.

At least that my thinking on it, I would always want my bar on the inside of the cab.