PKA,
My business is an S-corp.
This helps separate my personal from business incomes.
I have an ex-wife (who doesn't?) and it's very pertinent for me to keep the two separate. You could easily form a LLC, many docs do that. But the income from an LLC is counted as personal income.
About vehicle: I'm not sure if you are asking about a literal "vehicle" or using the S-corp "as a vehicle [toward some specific purpose]" We lease a business car for my business use, and personal use as well. The full cost of lease is tax deductible whereby a purchase can only deduct the depreciated value per year.
If you want to hire your wife, then hire her. My wife worked for me and it worked out great. She was the office manager and office R.N. She worked for pennies on the dollar too compared to what the hospitals pay for R.N.'s.
