If I were plumbing it today, I might consider going that route, as my present tractor has a rear remote channel. But at the time I assembled this, my tractor only had Power Beyond, which is a live loop between hydro pump and transmission. So, I used a typical live-center log-splitter valve.
Honestly, the way I did it is probably more convenient, if you have a live loop feed (eg. Power Beyond) on your tractor, since standing at the tailgate while dumping is better than way forward and blind at the tractor.
Nope, only valve is on the wagon.
My wagon is steerable, and very highly so. Look at the way I jackknife it into position at the house, and miss that window sill by a mere fraction of an inch! You can't do that with a regular fixed-axle trailer.
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I had worried about that myself, as maneuvering my wood lot is tight. But I've found this steerable trailer is actually better, because it follows exactly in the tractor's wheel marks, rather than having to swing wide just to avoid the trailer cutting the inside corner. My damn loader forks stick so far out in front, heck even the bucket does, that "swinging wide" just isn't an option in my storage area.
The reason I bought the steerable wagon configuration is that I wanted to put 4000 lb. of wood in the wagon and just park it. I didn't want to be dealing with the danger of the thing going wheelie as my family unloaded wood from it in less than perfect fashion, while it's sitting un-hooked on the patio. Since then, I've found many other uses for it, like filling it with dirt from a dig site, and leaving it parked full of dirt while I work on various underground utilities around the yard.