It is not uncommon for large auto dealership groups to put their stores on a common dealer management system. In fact, it is basically an unwritten rule.
It may be common, but moving every store to one DMS is not necessarily the best business move. The truth is, every DMS has a different cost-benefit ratio and it is not always one-size-fits-all.
So, why do the big guys do it? Simple: Legacy DMS providers tell dealers it is too hard to work with multiple systems. It does not make sense from a cost perspective. It is too time-consuming for dealership management to learn how to access reports. Employees will not be able to easily move from store to store because they will not understand how to use an unfamiliar DMS.
Of course, these providers also have a big stake in a dealer's actions. If a dealer acquires a new rooftop and chooses to stick with the DMS that the store is currently using, the legacy provider loses out on that store's business and exposes the group to a competitor's product. This could ultimately lead to a loss of all of that dealership group's business.
These messages persuade many owners to move new stores to the legacy provider they already know. But why? Staying with the current DMS provider can make the acquisition easier and more immediately profitable: less employee disruption and no conversion costs.