Santa Clause, Indiana, .... Camp Roudolph, which is the campground next to Holiday World and Splashin' Safari. They have permanent installed campers one can rent out (like cabins). Here's a photo of how they installed a permanent sewer line. Sorry, I do not have a closer photo of the actual connection.
But, it looks like they simply cut the end of the pipe on the camper and connected it to the white PVC pipe. You can connect them with a "boot" too:
Connect the 2 with something like this:
Click here.
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2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually