All this talk about runaway jackknife turned over loads and propane tanks, head on crashes on the highway, brakes not working, one trailer getting dicey. Holy cow. Sounds like we're all gonna die. I sure did stir the puddin'. I don't know if some HST's have more control than others but with any load I've pulled all I have to do is let off the forward pedal (gently) and it stops. If the back tires are on pavement it just works. Grass and gravel is a different story. Unless it's creeping forward, the only time I use the brake is for parking and it locks it down. The electric brake idea in the rear trailer won't work very well because of the varying weights involved. If you set the brake for a full trailer it will just lock up the tires when it's empty. You know there are a lot of these trains out there and they are being pulled by 300 lb lawnmowers. My little engine weighs 600 lbs with the fiberglass body on it. It works fine. I've been using it for 7 years pulling 4000 lbs at a time. It's doing what it's designed to do. When you distribute that weight over 10 tires it isn't excessive. Don't you think a 2400 lb diesel Kubota would have more control? So far no jackknifes, propane tank explosions, plane crashes or floods. Just a lot of fun. Glad you like my receiver hitch though. I haven't had to use 4wd on dirt or grass but I don't do that very often. It's always had enough weight on the back tires to maintain traction. Thanks for all the comments.