Lets see here:
If someone where to come and offer my Toyota Dealership in Smallville, TN SEO optimization, I would send them home. Why? Because you already have nailed it. city + OEM brand. Most other dealers have gotten lots of free advertising with their sticker on my car that people would know to look up Carsten's 10 cars lots. Another reason why SEO isn't that important.
I keep seeing lots of posts of trying to out smart Amazon. I am smart, but they are smarter than me, most of the time. So, changing up the ecommerce experience isn't really needed since the masses have been taught the Amazon way.
I've got zero experience for selling cars on the floor.
Why don't you just imitate how your shoppers shop at your dealership?
Or is the tried and true ecommerce experience just more standard?
I'm going to argue this way:
Is your dealership known for quality and luxury? Then you better not being doing a website pushing pricing slider scales. Porsche Houston ... not that much better than a Kia dealer experience.
Are you a budget friend pay here lot? Then smash that page full of $300 down and out the door stickers every where. Push every sub prime lender you can.
If I were to build you a website, I would sit down with your and find out what the majority of your shoppers are. Then I will find out which aisles of cars are people populating on the lot. If possible, I'd get stats for the average price and average amounts for loans and how long they get a loan for.