Dealerships handle the vast majority of vehicle sales in the United States. That in mind, private-party purchases are an important part of the American car market, despite the lack of many security and financial services that come with dealer transactions. Caramel is striving to change that with a new e-commerce platform aimed at improving the private-party sale process by providing dealer-like services to individual buyers and sellers. Disclaimer: Roads & Tracks‘s parent company, Hearst, has invested in Caramel. Ask Americans how they feel about car dealerships, and there won’t be many positive responses. But financing a private-party purchase isn’t easy,…