Need to sell your used car in New Hampshire? Worrying about how to sell a used car? Horseless Carriage Cash For Cars helps used car owners sell their vehicles from quote to finish. We’ll answer any questions you have about selling your used car.. When you start the process, you have many options to sell your used car. You won’t find a smoother process than Horseless Carriage from start to finish. Don’t bother finding a buyer for your vehicle via Craigslist or Facebook. We buy used cars for cash. Simply fill out the form on our website or call us at 603-607-6703 to get started in selling your used vehicle in NH.