I noticed on the Parts/Accessories page that they are now available. This may have been discussed but I was unable to find. If you have them do you like them? Are they a permanate install or remove after use type fixture? If you did the install, was it difficult? Should I have a dealer install? Would you recomend the 6 or 8? I couldnt tell much about the picture. Are they mounted under the rub rail? Thanks.