I would get the truck out of there legally of course.ASAP.Get it home. Make your decision later. Not now with all the duress you are under.
I understand all to well about living with alcoholism. Dont react to them...act on your own instinct. When you re-act to them , it leaves them in control and will lead to nothing but chaos. That keeps them in control.
Take charge, quietly methodically, dont waste your life on people who are living in the "stinkin thinkin" mind set. It will only bring you down.
The truck is repairable.Hearts do mend also. Just dont give it up to anyone.
My family tree is a nut tree also. I am a coconut...hard on the outside...but soft on the inside...LOL