Mr. B, as long as all the hardware is stainless, it will far outlast us and the next generation. In dealing with boats and trailers in saltwater all my life it's the dissimilar metals that cause accelerated corrosion. I've removed 20 year old 1/2" and 5/8" stainless bolts from saltwater docks...
Where's Jomo when you need him? ;)
If you're using 4x4s Nick a 4x post half base on the inside of each timber where your through bolt goes through will increase your strength there to a degree. Use another on the outside or the biggest flat washer you can find. I don't know if they come in...
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