I'll agree with everything said so far - no reason you can't use a single axle trailer on a 22. Sure the tandom is nice on the road, but singles are more than up to the job if spec'ed right.
Next question: how big is your yard and don't you need a big riding lawn tractor to mow it? If you have resonbly flat drive, a little square tubing and some creative welding should result in a very manuverable trailer mover.
Don
'01 22 Classic, 502/B1
And a bunch of other stuff
"If everything seems under control, you're just not going fast enough" - Mario Andretti