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A pull out outrigger, does not require a board as does the swing outs or attached outriggers. Ramps provide access for driving the vehicle right onto the trailer outriggers. This type of system provides for a more stable loading as you don't experience movement on the board. An outrigger board lays on top of swing out or attached outriggers. The left image shows a board on attached outriggers. The end of the board has the potential to "flip up" once a wheel begins to travel on the board. Precautions should be taken to avoid "board flip". A trailer with outriggers is generally 96" or 102" wide. A 96" trailer is generally used more with agricultural equipment hauling. The outriggers can then be used to increase the trailer width to support as we mentioned earlier larger pieces of equipment that need a wider base or wider trailer. Another advantage to pull out outriggers like the kind shown below is that they can extend allowing a 13'6" wide trailer base. Whereas swing out outriggers might only add around 10" additional trailer width to each side. Pull Out Outrigger Attached Outrigger Swing Out Outrigger I mentioned "board flip", but boards can also brake or bust and so pull out's that don't use a board have that advantage. A board can bust easier depending on the spacing of the outriggers as well. Typically you will find spacing between outrigger supports every 12" to 22". Thank you and I hope you know more about trailer outriggers.