That looks great, and its a great idea! PVC is pretty hard, and it only flexes so much before it breaks. Plus when you bent it, you created weak spots. You might want to try connecting something to each wooden skid so they cannot spread apart from eachother. This will keep the PVC from tweaking and snapping.
I was suprised how quickly I broke my PVC landing gear, but my Frame is alittle heavy and I did come down on it pretty hard sideways a couple times.
I went back to the trusty rock crawler tires:
I am not sure how much they weigh, but they are indestructible, and do a great job of protecting my motors too.