Early on with this MH I had the drain line break because a support/clamp was left off. The moving part has the flexible lines in a C shape that roll in/out. Instead of a clamp at the end of the rigid drain line... at the flexible/rolling line, the only clamp was 3' back so the pipe was flexing and finally broke. A new pvc pipe and a $2 clamp at the end solved the problem.
I agree with Trackrig that a refer in a slide creates poor venting of the heat.
*A friend with a 2000 Beaver which had a flexible drain line that was a couple inches too short and finally pulled off... a longer line solved the problem.
I would not worry about it.