Since you're using a Dealer.com website, there's an even easier way to do this. Assuming they haven't changed it, the Metadata tool lets you have all sorts of fun with javascript.
For this one, you can use the Metadata tool, go to new-inventory, then go to vehicle-details.htm and look at the Keywords box.
It should say something like:
This simply outputs the contents of the description tag, but DDC is kind enough to let us close that tag and have some fun.
Start by adding "> to close out the Keywords meta tag, then lets set a global variable to Model, negating any future issues with Santa-Fe or F-150 that you might run into.
This sets a global variable to the current page of window.modelGA that you can reference anywhere.
You can do the same thing to setup window.makeGA or anything else you want from their meta template tags.
You have to do this change here because GTM can't decode [Item Model], but the DDC metadata manager does.
The <meta tag="blank just opens a dummy tag that DDC can close for you, keeping all your page source nice and valid.
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