I would start with a terminal valve on both ports, follow that with a 45 degree fitting and follow that with a 3.5" clear fitting and a "hose cap with a garden hose fitting built in" on both. That should put your sewer connection "at or very near the trailer edge (don't go past it, bushes in campgrounds can rip lots of expensive plastic stuff off trailers). The reason for the terminal valve is to prevent "sewer splash" or "poonami showers" if a main valve leaks... No matter the quality or cost of the valve, toilet paper, a flushable wipe or even a bit of construction debris can (and usually will) find its way to the valve to cause it to leak at the most inopportune time.
Connect your "Y" sewer hoses and go from there. No need to disconnect or try to prevent "backflow". keep a "down grade level" from trailer fitting to campground fitting and you'll be OK.
The way your tanks are plumbed, start by dumping the black tank. When it's empty and as clean as you plan, close that valve, move to the galley tank (next most dirty) and dump it, then close that valve, then move to the bath gray as the last tank to dump. That rinses the hoses with the "cleanest dirty water"....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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