The Jeep Wave is purely about acknowledgement and recognition of each other as Jeep owners. Though your two Jeeps may have different build ups, it's that you "assume" each other shares a passion for improving and enjoying Jeeps. I will say it seems like JK owners tend to not wave. I believe it's that a lot of that crowd buys a JK for the look, not the functionality and off-road capability. Also, I've found when I wave at XJ/MJ/KK and other models they typically don't respond. It seems to be a Wrangler thing, unless the other models do it to each other, though I've never seen it. I seem to be saying a lot about it, but I don't think much about it and this is just my .02$.