After reading here about a guy who's kin pin is nearly 2" off-center, I'd be real careful about taking measurements from there, as it could lead to a false reading. I'd measure from the known centerline of the FRAME to the wheels. As others have said, there's quick and dirty methods of checking a gross misalignment, with the fist between the tires and string over the tires, being good ones. If any issues are found, I'd sure be contacting Jayco before I did =anything= else, including driving very far.
Lyle