A Spider lift is a self-propelled boom-type mobile elevating work platform which is designed to be light in weight, as compact as possible, and uses 4 stabilizer legs to achieve stability and levelling. Are spider lifts safe? Spider lifts are rugged and durable enough to work outdoors while also small and compact enough to work indoors. You won’t need to worry about hot or cold climates in spider lifts, as they can operate in most temperatures.