We use a (3rd? hand) Priceless Tugs 707:
http://www.pricelessaviation.com/wp-...ug-707-web.pdf
Works great, it's very maneuverable and has plenty of traction, but it's probably too much for the sub 5,000 lb. plane. It's heavy and powerful and you have to be careful to engage the hand-clutch gently, otherwise it could really shove on the nose gear.