Am I being controlling or just realistic?

My husband has been in the US with a green card for over a year. He wants a $6,000 truck so we can repair the very in-need-of-repair house my grandfather gifted us. I work but my income does not pay all the bills so I've had to put our food and gas onto credit cards. The cards are almost maxed out. He does work around the house and some of the chores but he does not have a job outside the home. I have disabilities that prevent me from working more than 40 hours a week & I cannot switch jobs because I have to keep this one for sponsorship for him until October at least - so I have no way of making more money. With my disability, I cannot safely take public transport but I do not qualify for low taxi fare. We have one 20 year old car.

My question is this - am I being unrealistic or controlling to tell my husband he must find part-time work first so we can save for the truck before we buy it?

He hasn't looked for work because he claims he needs a separate vehicle - he won't get a part-time job that works around my schedule. He is also very specific about the type of work he will do - he won't work manual labor or in a grocery/retail store etc. He has a computer degree but he won't do programming or work at Best Buy Geek Squad etc.

He gets angry whenever I tell him he has to get a part-time job first because I do not make enough money to make the payments. He swears he'll get a job once he has a truck. Am I wrong to worry this won't happen?