I don't even lock my Trooper, I just try to make sure there is nothing worth stealing in there...which is easier to do since it isn't my daily driver. I also don't wash it so there is no shiny bling factor to attract thieves, but I know that's not an option for you VX guys...
X2, I just leave the Trooper wide open and empty. My VX lives in the garage now, where she belongs.