No matter how much business sense, expertise in sales and determination you have, car dealerships are notoriously difficult to open and keep above water. Large overhead is required to maintain a dealership after putting up all the money required for licensing, office space, a showroom and a large lot for your inventory. In addition, you will need to pay your insurance premiums and make sure your sales staff, mechanics and administrators receive their paychecks. Finally, you will need to manage what is sure to be your largest expense: an inventory of cars and trucks to sell.