[bestgenman]

I’m not an expert on this but I did stay at a Holliday Inn.   I don’t think you want the attachment points higher or lower , that is nearly level. Let’s say the towed vehicle is higher and the brake actuator isn’t up to par, you could get the car riding up and over the tow bar and hitting the coach during a panic braking event.  It isn’t as likely if the coach is higher since the braking force will force the car down under the attachment point on the coach.  This forces the car down and the coach up, the coach wins that battle.

Several of us gurus have used the Air Force One pneumatic braking system.  I have one and love it.