Good choice on the king pin. We had the 5th Airborne installed on our new Cyclone last year, and driving 2,500+ miles from Washing to Alaska was real smooth considering how rough and bumpy some of the roads were.
Those stabilizers will come in handy, especially if you have to park alongside the road for the the night. Just don't forget to loosen them up before you adjust the landing legs (Been there, done that), took me a few time to remember to do so.