when i say ambition i simply mean when there is no work on thursday at his construction job then call the delivery place and see if they have a few loads you can run for them today, you know odd fill in jobs on days he not getting hours at his main job.
As I see it, then, this definition of "ambition" is about bringing in more money. It's not about improving one's self, connecting more strongly to community, learning a new skill. He'll see it this way too - there's nothing "self actualizing" about making deliveries, it's the kind of thing you do only for more money.
Money really isn't a very good motivator, as shown by countless studies over the years.
"Ambition" is a word usually used for a higher cause than mere materialism.
It seems what you want isn't "ambition", it's an easier family budget to balance. Nothing wrong with that goal, but equating it to "ambition" will come across to many as disingenuous.
i once worked a full time job and two part time jobs and the only heartbeats depending on my income was mine and my puppies. i do what is needed to make sure business is taken care of and im not seeing the same in him even after i sat and talked with him about these things in june of 2016 and nov of 2016, i checked with the delivery companies and they said yes they could use a drop in person for unexpected delivers so i don't understand why he hasn't done it, i even mentioned driving for uber, he has an active cdl with hazmat and tanker endorsements so his job options are almost endless as things will always need to be driven and delivered places but he says he's not a truck driver and he's not doing that.
This entire paragraph makes it sound as if you need him to be the same person as you. That never works. Everybody is different; a strong relationship comes from honoring and respecting our differences. He isn't you. He never will be. Comparing yourself to him only demeans him.
Find another way...maybe instead of telling him what to do, ask him what motivates him. "If you're not a truck driver, what are you?" If it's construction, maybe he can find a smaller company that needs part-timers from time to time. Speak to what motivates him - not what motivates you. The only way to get someone on your side is to first move to their side and then show them the pathway over.