Few know more about motorhome handling and tracking than Henderson's in Oregon. When they align a Class C, they do what Harvard here on this forum discovered on his own. Don't set the CASTER to the middle of is range which is around 3-degrees. Instead go for at least 5-degrees (max is 7-degrees). Because of the way the front end's built, passenger side caster will be 1/2-degree more than driver side.
Be sure your front tires are inflated only to the pressure required by the actual load determined on a scale. That alone will aid steering AND ride.
Back to Henderson's. They told me that adding a Safe-T-Plus stabilizer to the front and a SuperSteer Track Bar to the rear settles most Class C handling issues. Personally, I'd rather get the alignment right first, but they're the experts.
Weighing it at a truck stop costs only $10 and adjusting tire pressure is free.
Here's Michelin's Pressure Chart