Haven't replaced, but are about to do my first repair. Started leaking at the back corner of the black water tank, as previous owners drug ground a few times and wore it thin (through).
What issues are you dealing with? These tend to last forever, and can be repaired. Don't try any epoxy repair products. Almost all will fail over time, and more quickly with the motion of a trailer. Get a good plastic repair kit with an iron, rods, stainless mesh etc. Pretty inexpensive on Amazon.
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