The TrailManor 2518KB makes a compelling case for the hard-sided expandable category: it folds down short enough to fit in a standard garage (helped along by the swing hitch that shaves another two feet off storage length), tows with a minimal fuel penalty, and owners say setup takes around five minutes. Inside, you get a dry bath with a cassette toilet and shower, a Fantastic Vent ceiling fan, marble-look countertops, and a Suburban 20,000 BTU furnace for shoulder-season comfort. The rubber torsion axles with independent suspension give it a notably composed ride for a lightweight trailer. TrailManor owners tend to hold onto these long-term, which tells you something about how the concept works in practice once you're used to it.
Other expandable trailers floor plans (around 21 ft 6 in), similar in size and price to the 2518 Series 2518KB.
