jajwrigh,
Thanks for the post. A hydro will pull a sulky much better than any gear drive walk behind. Will the Metro do the job? The simple answer is yes. You must realize however that by adding a riding attachment is just like adding a trailer behind your truck. The objects being towed will increase the load on the drive line components and potentially cause a higher rate of wear. Keep an eye on your belts to make sure they stay in adjustment and replace them if they become cracked and most important "clutch" the drive levers when shifting gears. "Shifting on the go" with out clutching the drive levers will cause the shift keys in the transmission to wear prematurely requiring replacement.
Thanks,
Terry