I am renting one again this Sat.
a couple things...
Just because the machine will level enough to operate doesn't mean it's safe...use your head, observe what kind of ground (how solid/ how level) the outriggers are on. You may need pads under the outriggers on softer ground.
If the machine looks like it's been through hell....it probably has...check out how the machinery looks, in person, before actually renting.
These style lifts will not insulate you from grounding a conductor...I suggest staying away from elec. also...If you must trim by wires use only approved non-conductive tools , know what the voltage is, and learn the minimum separation for that voltage (for the untrained/non-qualified it's never less than ten feet for you or the machine).