2005 Envoy lowering question

Hi, I'm new to this forum, but have been around a couple of the other GM forums. I am in the process of buying an 05 Envoy XL SLT, and I need to drop the height a couple of inches to make it easier for me to get in/out of it (i am in a wheelchair) It is a 4X4, and I need to find out if anyone else has done a 2" drop, and what manufacturer sells a kit. Thanks for the help!