40s Can be done!!! But its not easy.
See: Picture number 4 on the site posted
http://thehummerclubinc.com/Media/Images.aspx?I=246
This Black SUT is Custom Body Lifted 2". He also cranked T-bars and did something with his coils in the back. There was alot of cutting and welding involved in doing this lift. Yes those tires are on stock rims and I have never heard of Rick bitching about loosing beads.
Guys I would like to thank you for the great response. So far I have learned that I will be purchasing the Cognito kit before I do this. Now I just have to figure our the BACK END!! lol.
Eric