I believe that there are a lot of surprises in the possibility pool for emergency stopping a 3500# trailer from 75mph, and I've had enough surprises over the years to say that I really think that's too fast from a safety perspective. I don't think it has anything to do with trailer length or trailer sway, but rather it is because you have too many variables between the TV's anti-lock brakes the trailer, and a trailer brake controller which is just guessing about how much braking to do in the first place. You can't drive as if the trailer isn't there without the risk of discovering some day that it is already on its way to somewhere you don't want it to go.
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