The lowest or basic strength of aluminum and each of its alloys is determined when the metal is in the annealed or soft condition. This is designated as the O (letter O) temper. For example, the annealed condition for alloy 1145 is written 1145-O.
What is a scissor lift? A scissor lift is a type of aerial work platform used to lift personnel. These platforms extend and retract vertically with the help of the scissor linkages that fold in a crisscross manner. Scissor lifts are typically electrically powered although there are some that are powered by internal combustion engines.
The bucket lift will have outriggers won't it. This scissor lifts don't as a rule and they are tippy. I'd go for driving them on a sheet of 1 1/* for plywood shimmed to level but not on soft ground or a lawn where it might sag to one side with you 15 feet up mashing on the down button as hard as you can.