Seeing this post at The Symbolic Past, I felt inclined to look through my photos to see plots with more than one wife listed on the tombstone.
The Gilbert monument in Chester Township Cemetery has a front panel that lists Joel Gilbert and both of his wives, Criscilda and Naomi.
Nearby, Rev. J. R. Thompson rests with his wives, Laura and Delia.
There are a lot of other stones that could be for a man and more than one women to whom he was married, but without the clear moniker of “his wife,” I didn’t post them. The second woman on the tombstone could be another family member (sister or cousin) or, if the birth date is significantly later, either a younger wife or a daughter.