[EricH]

The horizontal red lines are easy. Simply add or subtract dimensions.

That line coming in at the top indicates the location of the center. If you know that, then you should be able to figure out distances from the driver's station and the bump...

Ditto for the vertical red lines, but you'll need to use the distance from the center line (labeled as 6' 8" in the drawing, which is where that picture came from).