Building a show truck is serious business. The competition between builders is constantly ramped up in an effort to be hailed as the best. But what happens when the only worthy adversary out there is your own previous build? Randall Robertson, owner and operator of Rtech Fabrications in Coeur d’Alene, Idaho, is faced with this challenge each year. And his latest masterpiece, nicknamed “The Ponderosa,” might be impossible to defeat, even for him…