Having tire cupping on outside edge of left front tire along with cupping on inside of right tire.
The alignment is OK, no knife edge or uneven wear on surface of either tire. shocks are new last year about 6,000 miles on both the tires and shocks . any ideas,???.
The coach is a 2003 American Revolution 38b with 68,000 miles. oh, the tires are Goodyear 278/80/r22.5.
When you say the alignment if "OK" do you have a full printout of all the numbers? Did you confirm the center of the rears point to the center of the front axle?
I believe it is called "Thrust Angle" and it should be zero otherwise the rear of the coach "dog tracks" and one side sticks out relative to the front tires.
(On vacation at Nurburgring race track in Germany)
Retired Tire Design and Quality Engineer (40 years experience).
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