[MitchF150]

Maybe it meant them as an 'option'?

I've only seen disk brakes on 'high end' trailers.. I've seen 'em on a boat trailer once, but it was a pretty fancy one with dual axles and the boat that came on it was one of those fancy 'bass boats'..

Those brakes were hydraulic and activated by a surge brake setup on the trailers hitch.

Electric brakes are more common on travel trailers and other land based trailers. They are also usually drum brakes. Even if you had electric drum brakes on your trailer, a flat four won't run 'em.. You need a seven pin and then you need a brake controller plugged in the cab.

Back in the day, we had a 19' Fiberform ski boat with a Calkins trailer. It had to weigh some #5000 when all gassed up! That trailer had NO brakes either! Towed it with a 1971 F250 and while you noticed it back there, you just had to brake a lot sooner then normal! It still stopped ok for the most part however...

These days, you need brakes on the trailer if over #2000 I think it is in general...

Mitch