Some campers do have 2 grey tanks and yours appears to be one of them. The procedure is is still the same. Dump and rinse your black first then dump grey 1 followed by grey 2.
2021 Transcend Xplor 247BH
Husky WDH with Sway Control
2013 Chevy Silverado 2500HD LTZ 6.6L V8 Duramax
Forever in my memory. Forever in my heart.
Laurie J. Wood 3/22/67 - 8/23/19