A folding camping trailer...

POP UP TRAILER

Also called "pop up trailers," these are great for family summer vacations when the weather is mild. They are also the least expensive RVs and can be pulled by smaller cars (even subcompacts) than those required for regular trailers. As their name implies, folding camping trailers fold up for rolling down the highway. Once at the campsite, however, these compact units are easily expanded into remarkably spacious RVs  found in bigger units, including a porty-potty and shower in the largest.

Smaller units usually include one or two queen or king-size beds, a sink and ice box, and a little bit of cupboard space. Folding camping trailers are often the first RVs a young family buys, and provide many memorable vacation memories for children.