A method of transporting proppant to a wellsite can comprise transporting a plurality of trailers to a proppant-loading site, each of the trailers comprising one or more containers. At the proppant-loading site, proppant can be loaded into the container(s) of each of first and second ones of the trailers. A long combination vehicle comprising a truck and the first and second trailers can be formed at least by coupling the first trailer to the truck and the second trailer to the first trailer. The long combination vehicle can be driven from the proppant-loading site to the wellsite after proppant is loaded into the container(s) of each of the first and second trailers at the proppant-loading site. Less than 1% of a distance that the long combination vehicle drives from the proppant-loading site to the wellsite can be on a public road.