Are fluid levels at correct position (hydraulic, water, oil, etc?)
Are tires properly inflated and in good condition?
Are decals in place and legible?
Are hydraulic lines in good condition and properly connected?
Are safety harnesses and lanyards available?
Is the vehicle fully charged or fueled?
Are all controls operable from the ground level?
Are all controls operable from the basket?
Has the forward and reverse directions of the vehicle been identified?