Ok...one question. If you have to monitor that he pays his cell phone...why does he have one? To me, if he wants one and you can't count on him to be responsible for it...let him get one of his own, on his own. If for some reason his credit won't allow that...he can get a pre-paid cell phone.
As far as the truck goes...ok, that I understand. And selling it and providing him with a truck out of the proceeds...was only a suggestion if you felt you absolutely had to do that (personally, IMHO....he can ride the bus to work.)
Since the house is yours...pack his crap and put it outside. To me that would be as effective as you moving out...which of course if you owned the house previously, I wouldn't do either ;-)
My main point is, whatever you choose to do, you're going to have to do something to wake him up. Perhaps he won't wake up. Here's something our C has asked me before and it's a good question that applies to you as well...."if this doesn't change, if he can't/won't do what you need him to do how long are you willing to live this way?"
Unfortunately there are times we have to cut our losses and move on. I'm hoping this isn't one of them for you.