While most forklifts are designed to operate indoor or outdoor, if your primary function is indoors, you will likely not want a traditional internal combustion forklift. Electric forklifts are becoming more popular for indoor applications due to the elimination of emissions and the quiet operation. The problem is that since they are so new to the marketplace, there are not a lot of used electric forklifts available. If you are looking for a used forklift to use primarily outdoors, the most important question is what type of terrain you will be operating on. If you are operating in gravel, mud, snow or other uneven surfaces, you will likely opt for a rough terrain forklift, but if your yard is paved or smooth, you could get away with a used pneumatic tire forklift.