Another thing I thought of with these shower pans......
If you camp in a cold climate or store a coach in cold climates, you don't want to step on the pan until it is well warmed up from the hot water if the pan is cold. Plastic gets pretty brittle in cold temps. If you have any flex in the pan to begin with and then step on it while it is cold, that is going to probably create a condition where it could crack depending on the amount of flex.
Needless to say, you probably don't want to step on the shower floor in general when it is cold if there is any flex in it.
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