you could put jack stands under it when you know its going to sit for any length of time. that will elevieate the flat spots on the tires. just make sure you have wheel locks on your rims, dont want to help theives out by having it on jacks and no locks on your rims. hell even put a chain or cable through a rim hole if you can and lock the rims to the axle for added security. i dont trust anybody these days.