Today's best portable grills are designed to pack into your trunk and carry into parks, trailheads, and campsites, so you no longer have to rely on those crusty, rusted public grills. They distill the joy of using the best gas grills into a convenient package. No, you don't get the hyper-specific functionality of the best outdoor griddle to make smashburgers or the best pizza ovens for a Margherita slice in the backcountry, but you can grill fish fresh from a river or the best cuts of steak that've...