I checked out Rockstompers web page this morning to look at their weld on beadlock rings. I'm thinking with a couple of hours on the Bridgeport I can make a similar product. The issue with a 40 series is going to be adding another inch to the inside of the rim right where the steering arms get close. Anybody have any experience with this? They have a nice page at Rockstomper.com in the products section.