Rockers!!! Anything that keeps your junk off the hard stuff. Heck, I've laid my tube steps on some nasty stuff, but nothing has ever hit the body. So I'm happy. I've been meaning to get an engine/oil pan skid for awhile, although I've never hit in that area. Really the only time a TJ needs protection there is when you slide off a rock and there's something there that catches it right. Climbing ledges and such, Tjs almost always hit the T-case skid. It should definitely be on your to-dos though. I don't think there are many Tjs in this group with engine skids, however.