Introducing the WAVE concept truck : The Walmart Advanced Vehicle Experience, or WAVE, concept truck is the latest in our fleet efficiency program. The one-of-a-kind prototype offers a whole package of firsts. The tractor has very advanced aerodynamics and is powered by a prototype advanced turbine-powered, range-extending series hybrid powertrain. The trailer is made almost exclusively with carbon fiber, saving around 4,000 pounds which can then be used to carry more freight.