First let me say, I'm not an expert in this field.
However, I would put the truck under the corp. The purpose is to release you personally from liability in the event of an accident and lawsuit. The business could loose everything but you would still be protected personally if the corp. owns the truck. If you get into a severe accident and you're the legal owner of the vehicle, you're personal assets such as your home is at stake. I would remove all personal liability.
Just my $.02.
PLEASANT VIEW LAWN SERVICE.
YOU'LL LIKE WHAT YOU SEE.