The trailer you’re probably thinking of is a horse trailer —often a living-quarters horse trailer or an RV/horse-trailer combo. Common brands in that category include Equi-Trek, Featherlite, and Equine Motorcoach.

What it usually means

A horse trailer is a towable trailer designed to carry horses safely, with features like stalls, ventilation, ramps, and sometimes sleeping or living space for people. Some models are built more like luxury RVs than plain utility trailers.

If you saw a specific one

People often refer to:

  • A living quarters horse trailer.
  • A horse trailer RV combo.
  • A luxury equine motorcoach.

Example

For instance, Equine Motorcoach makes trailer/RV combinations for hauling horses and living on the road, while Featherlite and Equi-Trek offer horse trailers with living quarters or overnight accommodation.

The most likely generic answer is: a horse trailer.