2014 Roadtrek E-Trek , 2014 Roadtrek E-Trek We are truly proud of our new product, the E-trek. The unit uses its primary fuel, diesel, to provide heat and hot water through its combined heating core. These appliances use far less fuel than conventional propane or electric appliances, and are far easier to use. No lighting the stove with an open flame. No plugging in is needed for electricity (unless you want to). All the other key functions of the E-trek are powered by electricity, and you have great technology to deliver that.