There's some decent close-up pictures on the johnnyproducts site
Iwannabe, HP is irrelevant for using a johnnybucket. (much like HP is irrelevant for pickup truck towing capacity. Towing is all about transmission, frame, axle strength, brakes. You can get the same engine in a variety of towing capacities) Tractor tranmission output torque, frame strength and front axle strength are most important, followed by enough traction (tires/ weights..)to push it around.
Johnny does sell a jbjr for the ZTT42. He says if a tractor can support the weight of a snowblower, then it should be OK for a jbjr. Should work fine for moving around loose material like mulch or perhaps freshly delivered gravel. You may want to think twice about digging into existing dirt or gravel drive with the more complex steering mechanism and ZTR transmissions the ZTT uses, though.