With our new-to-us '08 Camelot PDQ, I finally found my water filter canister (no filter in it) waaaay back in the wet-bay. It was connected but just laying there and actually closer to the propane tank curbside.
Only way to access it was to go into the curbside bay in front of the propane bay and then reach it from the fore-aft pass-thru between them. By the accumulated dirt/bugs/etc, I doubt it had been moved in years.
I lengthened the hoses and mounted it on the wet-bay wall, where I can change the filter when needed.
Hope this helps.
2008 Camelot 40’ PDQ