On my 2021 the camlock is in the rear of the hose compartment facing out towards the passenger side. I too use camlock fittings (like Chuck) and carry the extension hose in a plastic box as there’s not enough room in the hose compartment for both the stock hose, the sewer nozzle and the extension. I added camlocks to both ends of the extension(one male and one female)to facilitate attaching the extension to the stock hose in case I need it. My nozzle is also cam locked like Chucks so it can be connected to either the stock hose or the extension.
Dan and Pam-Natalie-GSD's Sofi & Lindee
2021 Cornerstone 45 B
2018 Cornerstone 45 W (sold)
2020 Chevy Tahoe, etrailer XHD 10500 tow bar, Demco SMI AirForce 1.