I have a 2020 Alpha Wolf 26DBH, which may be similar. On the AW, the water pump is located in the left rear storage area under the bunk. I had to remove an access panel (two screws) to get to mine. Hot water tank is there, too, so itís easy to turn the bypass valves.
I bought a winterization kit since mine didnít come already installed but it wonít be a permanent mount. There isnít a lot of play in the FW supply hose and the winterization fitting puts a kink in the FW supply. Not a big deal but it would have been nice to leave it installed.
2020 Alpha Wolf 26DBH-L
2016 GMC Sierra 1500 Z71 CCSB