toy hauler
n.— «A good number of the units on display were of a style that didn’t even exist a few years ago. That would be the “sport utility trailer,” more commonly known as the “toy hauler.” A SUT is a travel trailer that doubles as a garage on wheels and can be used to transport All Terrain Vehicles, motorcycles, small boats or other bulky “toys” to the campsite.» —“America’s On The Tow: Small ‘towables’ and ‘toy haulers’ boost RV sales” by Mike Stahlberg Register-Guard (Eugene, Oregon) Mar. 6, 2007. (source: Double-Tongued Dictionary)