I just picked up my Chaparral 2 weeks ago. It's my 4th trailer, but the plumbing on this also has me a little perplexed. It is currently "winterized" dry with air pressure, but I can't find the water heater bypass valves. If it is on the back of the water heater, it is behind a screwed on panel in the basement.
But back to the OP. This may or may not help.
Mine also has 2 water hose connections close together.
The 2 on the left with caps. The lower one is marked "City Water Connection". The upper one isn't marked, but during my PDI the service tech said it was the black tank flush.