Bertie, well done for making the decision to end it. What are you waiting for now? He is unlikely to leave of his own free will as he still thinks (in his own weird mind) that you are bluffing.
FWIW my advice would be to go now. You said you had some RL friends you could go to, then go to them now. You can sort out your car etc from there. Leave before you relent, leave before he does more damage to your MH, leave before he does more damage to DC, leave before he does anything stupid.
As for the car (obviously I'm a bloke) dont waste large amounts of your precious £ on something too big or flash. Keep it small and simple. They are not glam or trendy but a ford fiesta or fusion would be a great start. Fairly economic, very reliable, cheap to insure, and really cheap and easy to fix.
Dont give in. Go now and make us all proud.