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Some semi tractors do use "occilateing 5th wheels" for tank trailers as they are too stiff to flex, van and flatbeds flex enough that it's not needed. I don't want my Montana to flex, read the posts on king pin welds. I noticed my Reece 5th has some wear on the front of the locking bar, also the kingpin has a grove wore in it, maybe 10,000 miles at most. I filed off the rough edges on both and it was pretty soft steel.
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