Multiple vines on one hill

I know I'm late asking this. I have two mounds with one vine each growing. Historically, each mound will be fully covered by it's single vine by the end of September. What damage would I cause by planting a second vine about 10 feet from the first one and letting it share the same mound? I'm trying to hedge my bet of losing a vine in the future. 

Any thoughts on this?

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