"Would keystone be so stupid as to bury the backflow valve inside a wall?"
Yes, and many others...
Backflow (if there is one) should be near where the hose connection is; anti-siphon is probably located behind shower wall at a higher point than any other water line in trailer.
You first should locate the area behind where the hose connection is for the flush line--look for a check valve right behind the hose connection. If there is one, take it off and inspect. If bad/blocked, clean or replace.
Joe
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'16 40QBH Phaeton
'21 Sahara HA toad
'15 38RSSA Mobile Suites--traded
'05 36TK3 Mobile Suites--retired but not forgotten
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