i just really wanna know
for skiing in the winter and skateboarding in the summer and it does not bend
I have done it and it was not a fun ride... my only suggestion to do this safely would to get a piece of steel piping and put it in your pvc, trust me when i say PVC will only bend so far before your on the ground... i would say stick to a steel rail
Ask yourself this:Is PVC pipe flexible?Could you stand on it without it bending?How well do you need to support it to prevent it bending or collapsing under your weight.These questions will answer your original question.
Moved to correct category (skateboarding).
You can recategorise other people's stuff?
Read his "related" list.
Making a PVC rail is probably no harder than gleaming a cube.;-)