Verbal abuse, faulty equipment

[codename]

I'm not really sure where to start but I do need some help.
I live in Ohio and I work for a vending company. We fill food machines at different locations (snacks, frozen, coffee, etc).
First problem:
We have large delivery trucks that break down all the time. Either brakes go out, tires fall off (no lie), no heat, non working speedometers, and most importantly bald tires. When I say bald tires, I mean they have zero tread on them. Being in Ohio, we get snow and our trucks barely make it down the road, and I for one have ran many stop signs and red lights because I simply can't stop. Some drives have went off into the ditch and we have hit telephone poles because we can not control the vehicle.
To be honest, I'm afraid not only for my life or the life of my helper, but the life of others on the road during the winter months.
Question of this is, do I have the right to refuse to drive the vehicle in it's current condition if I feel that it is not safe to drive? If I got fired or wrote up, do I have the right to sue the employer? Please don't get me wrong, Im not a person who lives in court to make a living suing people, I'm honestly afraid of hurting myself, the helper, or another person due to the bald and uncontrollable vehicle in the winter months.
Second:
We sell sandwiches that are made fresh at our place. We put this sandwiches in machines to be sold. When they out date, we must scan these items into a computer to show that they had outdated. We are told (by the owner), with a sign even on the computer we use to out date the sandwiches that we must punch off the clock to out date our product. If we don't start doing that, he will start taking the product cost out of our checks. I'm sorry, but not matter how good you are, you can not forecast who eats what, when, and how much. But yet, if we don't place a lot of food in the sandwich machine, we get yelled at by the owner because we did not put enough food in the machine.
Question, can he actually make us punch off the clock to scan out this outdated product? I have noticed that my time that I have even recorded is usually shortened by 1/2 hour or so do make up his lost money.

I just don't know what to do. I need to work as we all do but I'm in a situation right now where I just can't walk out. I don't want to give out to much info in the event he reads this. I'm sure you understand.

Thanks in advance for any help.