Qty (1) dead carcass of "Vandal #1" draped over said skid steer ?
Should work nicely to fend off future vandals...
Seriously,
My old W&S excavator came with a literal pile of sheetmetal on a pallet....
Was the aforementioned guards, is in the parts book, they covered everything.
But putting all those on everynight would have taken about 45 minutes and
involve 10 padlocks....and the little rat bastards would probably steel the pile
in the daytime when your off working....
I see you have many things that could still be vandalized, could you just have a 20' conex
box dropped off at the job site. Drive it inside every night, and put your fuel supply
in there too, 1 padlock and your done.