This template gives you everything you need for a professional, customizable and legally binding Bill Of Sale New Hampshire.
Only required for title-exempt vehicles, but smart to get one anyway. Even when not required, it protects both people if questions come up later.
You still want documentation. Mark the price as "gift" or "$0" and note the relationship between buyer and seller to avoid confusion about the transaction.
Generally no. For most transactions, either witnesses or a notary works, but not both. Check if high-value items have extra requirements.