Front drivers side tire is cupped so had it rotated to outside back dual and now the truck shakes when driving. Any idea to where would be best place to rotate it like inside dual maybe? And would it help to lower the psi a little bit more than the inside dual?
Has it not occurred to you that replacing the tire is the correct way to solve this problem.
Your tire is cupped because your steering and/or suspension is screaming for attention
you sure you don’t also have some bent rims . . . ?