Mines in the bed of my truck when it isn't being used. I usually only use it a race tracks and then it is chained to my front a-frame where it lives for the extended weekend. It's sheer weight, the chain, and the fact that there is an entire stocked bar and several coolers of beer act as great deterrents.
1998 Jayco Eagle 302FK (Honda EU3000is)
2016 GMC Sierra Denali 3500HD 4x4 Duramax/Allison
2003 Honda Aquatrax F-12X Turbo