I know Jay and he has a spare tire just like the rest of us, but he has writers that come up with his monologue.
All the times I have talked to him and ran into him at different car shows/auctions he has never cracked any fat jokes that I have heard. And trust me he is always slipping in jokes and silly comments because that is just his personality. In my book he is a heck of a nice guy that will go out of his way to help you out.
Billy