Brandon this may come off harsh but I'm doing it for the sake of your dealership. So no offense but please don't give advice if you don't know what you're talking about. While I agree that a lot of "dealer focused internet site providers" really suck at the SEO game by the looks of it your website sucks even more.
Quick issues I've identified without even giving it a full run through:
1) No mobile version. Giving 30-50% of your visitors a non-ideal experience right off the bat.
2) No navigation bar. People are used to navigating website with an easy to use navigation bar. Your buttons are extremely difficult to find.
3) Have to input contact info just to view inventory. Think of how many people bounce off that page as soon as they see that form. That's why you may think your website is "amazing" because you're getting so many leads. But it's not all about leads, you're losing out a TON on vdp views. A few other dealers have went the route of a lead form gated inventory but have executed it better. Take a look at Frank Myers Auto Maxx for a good example.
4) Text is hard to read. Enough said. Weird fonts. Size 8-10 used in some spots.
5) VDP's are horrible. Can't navigate photos - have to watch slideshow. The text again makes it impossible to read the options and features.
6) SEO is horrible. Don't even have basic stuff like unique page titles on a bunch of pages. Don't you think your pages should have a page title with more info than just "Easley Mitsubishi". You also don't have meta descriptions. Don't rely on google to come up with descriptions 100% of the time, trust me it can get ugly as evidenced by your SERP's. I don't even want to get into the more advanced stuff like structured data because it is clearly far over your head.
7) Coding is horrible. You really had to make the navigation bar image based with image map links. They have come out with something called CSS that can accomplish this and which Google can actually read among other benefits. That was an obvious item I quickly noticed, noticed much more lacking when looking through your source code.
8) Design is horrible. You look like a buy here pay here grade or mom & pop car dealership....not a franchise mitsubishi store. You are the reason manufacturers require dealers to use crappy website providers like cobalt.
9) Your google reviews are horrendous. 2 out of 5 stars. Really?? Work on improving that asap.
I could have went a lot more indepth but I think I illustrated my point that what you're doing isn't up to snuff.
So in conclusion Brandon you should seriously consider taking the path of jabarnes and start looking for a new website provider. I know it will hurt your pride since you created this from scratch and probably put a ton of hours into it but it's just not cutting it in today's landscape. Alot of dealers have succeeded with custom websites like Anderson Auto Group but you don't appear to be one of them. A website vendor is your best bet right now. Swallow your pride and make the change. You'll thank me later. If you don't eventually Easley Mitsubishi will hopefully realize they need to get out of 2004 and move on up to 2014 standards.
PS: I'm also hoping that Gilstrap Family of Dealerships is related to Suzuki of Witchita in some way. So not sure if you also "coded" gilstrapfamilydealerships.com but that is an EXACT copy of Suzuki of Wichita's old website. Not cool at all if that is the case. I'm hoping that the same vendor did both websites or you are the same company...