with my YJ, they will write it off if the damage is 80% of the vehicle value. the adjuster looked at the local listings, and then added 500$. i think for the add ons it was: 200$ for custom bumpers, 500$ for hard doors, 80$ for cd player, etc,. this was about 5 yrs ago, with a 93 yj with 210k, 4L 5 spd, tub was damaged so it was a write off. too purchase it back, they sent it to auction, and if you matched the winning bid (which was 1800), you could buy it back. caution though, if it is a write off, it is very difficult to get it back on the road. i'm sure different insurance companies have different policies. this was for ama