What would you like it to tow? Your best bet may be to call MTD +44-1869-36-36-36 I think is the number that can help you and find out its towing capacity. I'll probably end up putting a hitch on my lawn tractor so I can pull my 6x10 utility trailer around my yard but not very often because I think it might be a little much for it.
Be very careful about towing with that unit. You could very easily blow the transmission. They are not designed for towing and over weight or hills will put too much pressure on them.