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The Dealears private page is only for them to be seen and for an administrator to edit.
Admins can also view a Dealer page.
So you could give admin priviledges to a Sales Rep. Any user with the manage_options capability can view Dealer pages.
However, that also means those users can delete users, install plugins etc. They are basically an administrator.
Currently there is not filter to modify the capability from manage_options to something else.
Profile Builder would not help with this particular use case in mind unfortunately.