For a used car dealer license you do have to have an "established place of business" but there is the possibility of obtaining a temporary site license if you are planning on having a regular place of busines in the near future from what my understanding is. Plus the license application is quite detailed.

§ 43-47-8.2. Place of business; temporary sites; penalties


(a) A used motor vehicle dealer shall not engage in any activity as a used motor vehicle dealer except at such dealer's established place of business which has been registered under Code Section 40-2-38, at temporary sites not more than three times in any one calendar year, or at a licensed auto auction or any licensed facility. This subsection shall not be construed to prohibit a used motor vehicle dealer from delivering a vehicle off site, provided that the transaction is initiated from an established place of business under this chapter.
(b)(1) At least 60 days prior to opening a sale at a temporary site, a used motor vehicle dealer must make application to the board for a temporary site permit. A separate application must be submitted for every temporary site sale.

(2) To be eligible for a temporary site permit, a used motor vehicle dealer must be registered as required by Code Section 40-2-38. In order to obtain a temporary site permit, a used motor vehicle dealer must provide, on a form promulgated by the board: