More and more, it seems, outdoors types are abandoning the traditional tent in favor of pop-up versions that attach to their vehicles. These sleeping units tend to keep you drier and also keep curious critters from disturbing your slumber. Roofnest sells a variety of rooftop models designed to fit different sizes and types of vehicles. The Sandpiper, one of the company’s more popular designs, comes with a built-in aluminum roof rack atop a hard collapsible shell that can support up to 100 pounds of camping gear and equipment. Other features include a quilted roof, high-density foam mattress, plenty of ventilation screens plus a number of storage pockets. The Sandpiper sells for $2,800 from www.roofnest.com.