If they have air brakes, and trucks generally do (or used to anyway), you can cut the air line and the brakes will lock. It’s a fail-safe design. If the brake line fails, you want it to fail in the stopping mode, not the “no brakes” mode.
Seems like that would be a pretty inexpensive way to make a truck very hard to move.
Removing the caging bolts from the air chamber. That’s it.
A Trucker’s advice on how not to be towed (vidya).
https://gettr.com/post/prnmvk3954
Draining tank probably does the trick too.