Bosch aluminum. Dino (Islandson) work with it and customed that rack

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No kayak trailer is going to crash your car because of tongue weight.  A 5000 pound car on a 2000 pound trailer will though. 

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Maybe if someone was towing an overloaded kayak trailer with two PA14's behind a Prius with negative tongue weight.   

But, I agree, most kayak trailer setups are light enough that they shouldn't pose much threat to the tow vehicle.  You can experience tail whip that can flip a trailer, but highly doubt it would affect the forward momentum of a truck or midsized car.

Negative tongue weight is bad and can actually cause your ball and hitch to separate in the up stroke of a bounce, if it doesn't flip first it will usually result in a nice series of dents pounded into the back of the tow rig as you come to a stop.

Positive tongue weight should be at least 10% of the weight of the entire loaded trailer weight.  Any less than that and it's a gamble if loads shift on you. 

Pay attention to too much tongue weight if you are using a class 1 hitch.  It has the least amount of strength when it comes to leverage.  200# is the rated max for tongue weight.

Thanks for all the input everyone!  Mojo, I would have jumped all over that offer except me and the boy spent the last couple evenings throwing something together.  Not quite as fancy as some of the ones I've seen but it should work.  I'll put up a picture when we finish up.

This is a wobbler built snow bear special and works awesome.