I ride a 2003 Valkyrie CSC Trike. It’s front tire is a Dunlop 404 Rear Tire with backward rotation and 40 to 42 lb. air pressure. It has 18,000 miles on it with no cupping.
My last front was a Brigestone Battlax Rear Tire with backward rotation and 40 to 42 lb. air pressure. It started to cup on the left side at 13,000 miles. I replaced it at 14,000 miles because I did not like the ride.
Happy trails,
God bless