THE BREAKDOWN The Aboard T4 is a hybrid-electric travel trailer with its own battery and electric drive system. Instead, it features clean surfaces, large dark glass areas, and a shape that looks more like a concept vehicle than a family travel trailer. In the best-case scenario, the trailer simply drives itself exactly where it needs to go. It is much more angular, much more off-road-focused, and closer to an expedition trailer than a conventional travel trailer. Motor1's Take: The Aboard T4 is one of the most compelling examples yet of how electrification could transform the camping experience.