What year is the Road King? If it's under 12 years old and less than 75,000 miles you can get this:
Extended Service Plans | HDFS | Harley-Davidson USA
Has an optional Tire and Wheel coverage
I signed my DWG up last year, it's nice to know if I break down they'll come get me, fix my bike for a $50 deductible and if I'm on a trip reimburse me for a hotel and/or a rental.