Not to be negative because I admire your passion.
But if the average age in your area is 34 and the average income is 36000$ you really have a hard road ahead to establish your business.
The area I serve is also around 15000 people, I have 2 types of customers, "Rich" or "Old", they could be old and rich also.
It makes no sense to be brand loyal, just seek oout good deals on commerical equiptment. GMC is a good choice, but a heck of a deal on a ford is ok.