Hi sorry I'm a little late to the game. Yes I have one (well the slightly heavier one but same rigging I'm sure). I have a team pole on mine and we ended up mounting the two single trees up-side down on the underside of the pole. They were knocking into the pole itself when they were mounted to the top but it was a simple fix to turn them over. It also dropped the line of draft a little bit. The breaks won't stop a determined horse and sure won't stop a team. But it is enough pressure to keep them steady at a stop if you have one that is a little anxious to get going.
Go through the whole thing and tighten screws/bolts and add loc tight where needed. They get shipped over from his manufacturer overseas and things tend to giggle loose. Especially the break assembly. I also drilled a hole each end of the long threaded rod that attaches the shafts/pole so I could put a cotter pin in each end. It has an nut on each end but I wanted to be sure that nut didn't screw itself off the end of the post on a bumpy ride.
Overall it's been a great little cart.
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My single minis can pull this as well. I only drive them single on smooth hard surfaces where it rolls nice and easy though. A team could pull this thing anywhere. It didn't weigh a lot more than the one you are looking at so I went for it.
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Here you can see where we've put the single trees upside down mounted to the bottom of the pole.
Let me know if I can help answer anything else. We have the large horse marathon cart from them as well. We've tweaked a few things on it too but nothing major.
Oh... the seat vinyl is crap. It fades really quickly. Plan on re-doing it after a couple of years. I don't mind though because it means I get to do whatever color I want. Mine is kept in the barn and I've had it 2 years. I give it another 2-3 before it needs new seat vinyl.