The racks I make suck up 20 feet, but they are expedition weight. generally the preferred tubing bender is the Rigid, older model.

This is pricey, but would probably be worth it for a lot of bends:

http://www.aircraftspruce.com/catalo...rtypebendr.php



I use one of these:

http://www.princessauto.com/workshop...l-metal-bender

I bought it on sale. I don't use the pictured dies, I substituted 2 machinery type pulleys. I filled them in with epoxy using a Popsicle stick. Perfect 3/8" radius. Later I turned rollers for it out of steel.