Sounds like a floating rail will be your best bet. When you start talking about sinking posts, your going to be carrying around alot of extra equip just to get the rail built..much less gonna run out of time to build it, hit it, and take it down in a day. A flat rail needs to be at least 24-30ft to be somewhat worth while but thats still going to be super duper short.... If you float something instead of sinking posts, you can build it in several sections that float alone and bolt them all together to make one long rail...
CH
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