Though several references state the Oregon limit is well beyond your 60' combo, I think you meant you'd be 10' over a 50' max (not 10")? Nevertheless, some references have it as a 65' max, with some selected highways 60', 50' or shorter. As for Mr. Kelly driving well over most state's combo limit for many years and getting away with it. Have you thought about the risk you put on some sleeping baby's life or yours if you were to jackknife? Are you sure your insurance company will pay physical/medical claims when the forensic police report discovers you were pulling a 73' rig? Good thing the adjusters are too dumb to perform a simple internet search to evidence your public boasting here in social media!