I can only zoom in and stare at her thighs for so long, but I'm pretty sure she isn't wearing a seatbelt. Which if you were forklift certified you would know is rule #1.
Nobody at the grocery store I used to work at would wear the seatbelt. One time the district safety manager was touring and asked a manager (who didn't recognize her) about it and he got in so much trouble.
Oh, so it's hot when they're forklift certified goths, but an alt girl doing donuts riding the forks of a powered jack is a "safety issue" for everyone.
… then again I'm an alt girl(ish) person too – is "alt girls doing donuts with a pallet jack" a stereotype I was previously unaware of? I didn't get declared a public menace though, much to my disappointment.
When I worked for asphalt plants as an operating engineer, we had 988 Loader Barbie. She could fill a bunker, top a silo, or dump a load in your bed. She really knew how to operate a center articulated front end Cat.
I'd guess a propane tank. I don't have any experience with forklifts, but I know there are lots of propane powered ones (in addition to the electric ones)