Timeshare Resales USA GMAC is the first strategic partner of GMAC Home Services to specialize in Timeshare Resales. Our principals have been in the Timeshare Resale business for over 20 years, giving us the experience and ability to handle timeshare properties all over the world. Our sole interest is to get the properties sold in the shortest period of time in the best interests of both buyers and sellers. The GMAC Real Estate Service commitment promotes premier service. We are your trusted adviser, skilled negotiator and expert facilitator. With over 20 years of timeshare resale experience, our dedicated staff is happy to assist you with any request.