Yes, I have exactly the same problem. I stole my Jeep from the army base as I didn't want to pay the ridiculous price tag for this vehicle. It spawns in my garage, but as soon as I drive it away it won't let me back in with it. I have fitted a tracker and insurance as well, so it is recognised as a personal vehicle. On a side issue, do you have any idea why this vehicle is so expensive, I was thinking that it may be completely bullet proof, but I discovered yesterday it doesn't even have bullet proof tyres, and it's slow as shit, so I'm left thinking what's the point in having it..........................................?