Has anyone used PVC for arching over raised beds, then putting Reemay over the top? We used some 1/2 inch black poly pipe, and it's too flimsy for an arch over a 4 foot width. Are some types of PVC more flexible than others? How do we tell? Also, if we get some 16 footers, we can't carry them in our minivan. Could we cut them with pruning shears or should we take a hacksaw or a pipecutter with us? I need to know asap. Thanks in advance, Margaret L