SeaDoo behind the Towed

Are you sure that's a fifth wheel king pin connection, to a hitch with jaws that enclose the king pin???

I have a suspicion that what you're calling a king pin is actually a farm/utility/atv trailer pull-pin hitch, which is entirely different than a fifth wheel king pin hitch...

Also, the spirit and purpose of most of these state double towing laws requiring a fifth wheel king pin hitch on the first trailer, is for the hitching location to be over the rear axle of the truck doing the towing, not out behind the rear bumper.

The purpose is to ensure that the first trailer doesn't have a tendency to sway about, on a bumper location hitch, well behind the truck's axle, while forces are acting on the rear of the first trailer, by the last trailer. With the first trailer on a bumper hitch location, all that swaying going on behind the truck is transferred to the truck.

The forces the first trailer is exerting on the truck, are amplified by the hitch's location far behind the truck's rear axle. This can cause the truck to go out of control.

A swaying trailer has much less control over the truck when the hitching location is over the truck's rear axle, rather than 5 to 10 feet behind it, on the bumper. That's a long lever arm for the trailer to use to swing the truck about.

I would read this to clarify what can tow what and how third trailer towed behind a fifth-wheel being towed by a pickup truck is legal.

http://www.legislature.mi.gov/(S(nimm3hi2hmiu3vhxqdybnxy3))/mileg.aspx?page=GetObject&objectname=mcl-257-721

MI does allow double towing. My towbar is the Aventa II. No ball, it is a king pin design, so fifth wheel? That aside I am looking for info on if anybody has done it and their experiences. I stopped into the local police and asked about it, they said I couldn't pull two trailers. I explained and showed a picture of the tow bar. Then I was asked a question back to clarify, "So you are pulling a Jetski with a blazer, then pulling the blazer with a trailer ball-less towbar? To which I was told, sounds like a car pulling a trailer being pulled, so that is only one trailer, he was not sure how to handle this and his response was just don't speed and don't be over 65 feet long. So I have move homework to do there.

Many times on I10 we have seen a " car-tow dolly-car-towbar-car" and only surge brakes on the tow dolly. Not all the cars in good shape ether.

Apparently only behind a fifth wheel and a special license endorsement is required

Does MI permit double towing?