The original Kelley Blue Book has no section in which to look up the value of trailers. However, the company also publishes the Kelley Blue Book RV Guide, which contains values for used travel trailers, certain pop-up campers, fifth wheels, folding trailers and RV campers.
Consumers can search based on the year, make, model and number of axles on the vehicle. When searching the Kelley Blue Book RV Guide, it's easiest to search by type of trailer, as this is how they are listed. In addition, using the make and model section to cross-reference can narrow down the search to a specific model.