West Virginia makes UIM an option, bars any set-off against it, and treats multi-vehicle and single-vehicle policies alike for total coverage
West Virginia's rules are in W. Va. Code 33-6-31. Fault is in 55-7-13c and the deadline in 55-2-12.
Read how stacked and single-limit coverage differ in West Virginia, check what section 33-6-31 says, or see how West Virginia UM and UIM work.