hire a german guard, that'll work, also the rottie will help.
if they are not possiable maybe 2 different locknuts on each wheel and only park it in well lit busy areas, that way hopefully they will leave it alone
Gorilla locknuts is what you need. Unlike most locknuts that you can't hammer a socket over the top of it to undo. Gorilla lock nuts have a unique design which will just free spin if this happens.
Plus the socket goes on your key ring instead of in your boot. And they torque up as well as standard bolts. Which means you could use more than 1 set.