I have a suggestion and a question, Greg. First, the suggestion: I think you may need caster-type dolly wheels on the main frame, positioned in front of the cutting deck. Otherwise when the front wheels of the tractor tip up on a grade or bump, the front of the towed unit might dip down far enough for the deck to dig into the ground. I know this effect won't be all that severe because the tow bar on the tractor is up close to the rear axle, and the dip of the towbar therefore won't be all that great, but sooner or later someone is going to try it with a home-made towbar that sticks out further. A dolly wheel would also keep the front of the deck out of the mud when the unit is parked, not connected to the tractor. Second, the question: does the fitting at the end of the extendable boom have a simple lift-off towing pivot, and is there another similar pivot at the center of the tractor, so you can tow the unit to the mowing area with it in line with the center of the tractor? Then you could pass through gates on the way, and just pull the tow point over to the end of the boom when you are ready to start mowing. This seems like less of a hassle than sliding the boom in every time you come to a gate.
