I'm looking to put an air ride system on my moms 2005 Yukon 1500 XL.
I need to be able to lower it to make it easier for her to get in and out.

Any body know of system i can buy off the shelf??????

I know Air Ride has a great reputation. http://www.ridetech.com/

I watched the episode of Trucks where Stacey put the Air Ride 4 link setup on the Joe Gibbs Silverado. Seems the kit came with absolutley everything you could need :cool:

FWIW - an air system seems a bit extreme for what you said you are looking for, but it will work :cool:
They do make retractable step pads and other items that may meet her needs.