Rock trucks are a type of off-highway truck used to transport large amounts of material such as dirt, rocks, and coal across unpaved roads on construction sites, gravel pits, and in open-pit mines. These trucks, even empty, are too heavy for public roads, and typically carry loads of 100 to 300 tons.
The notary public is a commissioned representative of a state government and is charged with verifying your identity as the signer, ensuring you sign under your own free will, and witnessing the signing event. Their role is to prevent fraud and to ensure the appropriate people execute documents freely.
To answer that question, you have to first understand what a notary public IS. A notary public is an official witness to the free and willing signing of one or more documents by one or more people whose identity the notary has verified.