Lots of contracting companies are requiring the installers to provide their own truck and tools....where that wasn't norm before.
Many companies down here have been doing it for a few years now. It's a big expense for the worker to carry though.
If he currently has use of the van, then in essence you are a three vehicle family and you want to add a fourth vehicle. I assume your husband uses the family/your vehicle for personal driving. How often is he really doing that?
Unless his use really interferes with your ability to conduct daily life and manage necessary errands then I think it would be better to not purchase another vehicle now.
In saying that, I am not suggesting you believe that your husband's job is stable and he won't need a work vehicle at some point in the near future. I just believe your money is better off working for you in a savings account that gets interest. Take the amount you estimate the vehicle would cost and park it in a savings account, estimate what the insurance and other routine expenses would be and put that amount into savings each month. See how that works for a bit for you.
If you really want to get harsh and have some shock therapy, think of all the things that could go wrong with the vehicle. Write each one on a slip of paper with the amount a repair would cost. For each problem, write "Whew, the car runs O.K" on four slips. Put all the slips in a jar and each week pull one. Take the amount of the expense if one comes up and put it in that savings account.
I believe you will either save up a decent amount of money when you decide to buy and have insurance and emergency funds for a bit to rely on or your desire for a car will be cured. Either way you win.