Forklift rentals can be used indoors and outdoors, on flat surfaces and on rough terrain, and are used generally in construction or in warehouses. Any warehouse forklift generally only needs to be used on flat surfaces. There are different classes of forklifts, and the higher classes are harder and used more outdoors. Lower classes of forklifts are used in warehouses. Reach lifts can help reach up or over that large obstacle or lifting that heavy object over the fence a breeze.