You DON'T need to replace the other three, that's baloney. If they're the never adjust version, they're a bit pricey. I found them for $193 a pair (left and right) on e-trailer.com, so I guess it makes sense to replace both on one axle.
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2016 Montana 3711FL
2005 Ford F350, 6.0 diesel, short bed
Demco Hitchiker Auto Slide hitch
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