2002 1500 4x4 leveling lift

I have been trying to find information on the torsion bar leveling lifts that are available for the 2002-2005 Ram 1500 4x4's. Has anyone out there installed one of these things? I need to know things like:

Did you need longer shocks?
What size tires did you go up to?
How long did it take to install?
Are there any reputable companies that are making them?
Are there any websites with more information?

Thanks in advance for your help!

call summit racing and their tech can help you with your questions
http://www.summitracing.com/ 1-800-230-3030