Expandable travel trailers bridge the gap between "camping" and RVing. They are travel trailers, but possess fold-down tents at the ends, and sometimes the sides, for sleeping. The big advantage is that when folded, they tow very nicely behind a medium size passenger car or minivan. Young families love them because they can be towed with the family car, and still get reasonable gas mileage. They provide all the ambience of tent camping, but with the security and convenience of RV amenities.