It is an option for the manufacturer to join the RVIA association. It is sort of like a UL label in that it signifies that the manufacturer has agreed to meet certain minimum standards. The manufacturer does have to pay to join the RVIA just as he has to pay for the state seal on each coach. That does not mean that these are a line item option on your coach with an individual charge for those items. Obviously you are paying for these things but it is usually covered with the manufacturers overhead/profit. It is good that you have the RVIA seal but I'll bet that the state seal is mandatory otherwise you could probably not get a license for your coach. I wouldn't worry about it too much.