I think it would be beneficial for Lead Buyers (eventually Ambassadors with the sale side of the site) to have a differentiated experience. At present Lead Buyers can toggle between stores on the current site and it should also have similar functionality on the new site but have it be more easily recognizable.
Ambassador Buyer - Users who buy for multiple dealership will have one User ID. Dealership would authorize the User in the site (similiar to the current Ambassador program) to purchase vehicles on the dealership(s) behalf.