Welcome to the forum from Nevada. I've only had one RV with a rinse on the black and it's a nice item to have. My Current one doesn't have one. IIRC a rinse can be added to most tanks, but, I think that is one of those areas that I would prefer to have done in a shop.
Stan, Shirley & 2 Schnauzers
Former 2014 Daybreak XD34 Owner
USAF, Retired, Life Member: NRA, DVA, VVA, VFW, VSPA