If they total it, you have salvage rights- they can not take it away from you. Don't let them try that. I also frankly think that the truck is worth more than the estimate ($4k)? When my son's car was totaled ('70 Dart) we bought the salvage for about $68.
For a dented fender, wheel cover and some scratched paint. Some knuckle head sideswiped him, trying to get to an on ramp that he had missed.