A self tapping screw or two or three in every joint after you glue as told above.
I seldom put a plastic joint together without one, if that's all I can reach, or three if possible, self tappers put into the joint.
This does away with any fear of any wedged angle within the pipe joint.
And
They make flexible joints that adapt to any angle discrepancy from the standard 45/90/straight joints.
And
A stretch of silicone pipe under that driveshaft will take a LOT of banging without breaking or tearing. Armor the bottom of the silicone pipe with a half piece of abs pipe gorilla taped to it.
So many fixes available for such things.
When you went to Lowes or such to look at cures, what did you find?
But:
Spend a small amount of money on a macerator and an electric black tank valve and do away with the stupid 3" pipe running across the driveline. Tack the 3/4" garden hose expulsion line where ever you like to the undercarriage without concern for level or downhill.
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