A properly hitched two horse tag-along trailer is as safe as a gooseneck trailer. Tag-along trailers have a rather bad reputation because there are so many ways a tag-along can be hitched and it's easy to make a mistake. For more than two horse a gooseneck is a much better choice.
Never hitch a tag-along trailer to the bumper. Most bumpers are not rated to the capacity for a horse trailer and they are not adjustable. Usually the trailer hauls too high or too low, and it is absolutely mandatory that the horse trailer be level. A trailer that isn't level adds stress to the horses because they are always fighting for balance and the trailer will not have equal weight on both axles. This can cause swaying and uneven tire wear. A trailer that is too high in front will not have enough tongue weight to keep the trailer stable and one that is too low will add too much tongue weight to the rear axle of the vehicle.
You should always have a frame mounted equalizer hitch with a slide in ball mount. This is called a Class III or Class IV hitch depending on the weight rating. There is now a Class V hitch. There are two ratings stamped on every hitch:
- The weight carrying rating which tells you the capacity of the hitch without weight distribution bars attached.
- The second rating is the weight distribution rating which is usually about twice the weight carrying rating. In order for this rating to be effective, the weight distribution bars must be attached.
Any weight carrying hitch that does not meet the capacity of the GVWR of the trailer being towed must have the weight distribution bars to increase the rating .Vehicles with a shorter wheel base should always have weight distribution bars. These bars make the combination perform like one unit and they keep the front end of the vehicle on the road. Too much weight on the rear axle of the tow vehicle will lift the front end to unload the front axle and cause instability.
All parts of the hitch, including the ball and slide in ball mount must equal or exceed the rating of the hitch.
Neva Scheve is a recognized authority on horse trailer safety and author of, "The Complete Guide to Buying, Maintaining, and Servicing a Horse Trailer." You can learn more about trailer safety at EquiSpirit Horse Trailers.