Made a bike rack out of the front forks of anothe bike. Stuck a bar in the top and turned it into a tow bar... pretty darn solid and hold my milk crate... have pics of the bike in the profile photos area....
Actually if the bar was shorter (stick it in more for greater stability) - and you tighten the fork top onto the bar - the bar will stay in place securely. You would need diff size sleeves that fit onto the tow bar tip to accomodate diff towing projects. - To tow a bike it would need a little large sleeve to ride perfect...