Abstract: Disclosed is a trailer which is self-propelled via a powered tongue jack and which optionally includes a light-weight, high-efficiency asphalt heater. The trailer is moved long distances, such as to and from work sites, using a towing vehicle, in conventional fashion. When at the work site (or storage site), the tongue jack is lowered to support the trailer in a generally horizontal position, and, by virtue of a powered jack wheel, can be used to position the trailer easily, quietly, and confidently, in either the forward or reverse direction. The jack is powered by any conventional means, including an ac or dc electric motor or an internal combustion engine. A reversible, variable-speed, dc electric motor powered by a conventional 12 Volt battery supply is preferred.