I have had the King Kutter dump trailer for about a year and a half. It takes 31 pumps of the handle to fully raise the box. The hand pump lasted about 8 months before I decided to upgrade to a 12v battery operated pump.
I also use a tag axle, as the suspension of the ATV can’t handle the rated load of the dump trailer. I have no problems with the ATV/Dump trailer combo UNLESS I am carrying a full load of dirt in the dump trailer, and then I do not have adequate breaking power on the ATV.
I use a pendant connected remote that I run to the back of the ATV, so all I do to dump a load is push the up button. Way better than having to get off and hand pump the original manual pump. I purchased the 12v unit from Amazon and with the battery and the aluminum box to put it all in, I was another $500. to make the upgrade. One of the best $500 I’ve spent. I would have bought it with the 12v hydraulic unit already installed, but that’s not an option.
The best part is I can haul it behind anything with a 2” ball. Not just limited to my tractor as it is now self contained. I also added the stake pockets on the sides to extend the sides with some self made wood extensions for when I’m hauling wood chips. Yes its a big investment, but it is one of my better purchases.
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