ORIGINAL: timbercruiser
Get enough 3/8" (or bigger) HARDENED chain and use a large lock if you want to have any chance of your stand being there when you return. Locking the chain under the stand, harder to get to with a bolt cutter will help. Make sure the chain is hardened steel.
Also use a Harden Shackle Padlock and not the ones with case harden shackles!