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You're saying that minimum for a K5 is 18 + dovetail or you're saying a 16' plus the 2' dovetail = 18' is enough?
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IMO I like a 20' overall trailer. I've seen people get away with a 16' overall trailer, which IMO is the bare minimum. However, the weight is not as well distributed on a shorter trailer, putting more tongue weight than needed on the tow vehicle.
For reference, all my trailers are 18' plus 2' dovetail.