Most construction grade plywood is rated for a minumum of 75 Pounds per square foot loading (depends on support spacing). For example, 6 ft by 4 ft bed = 24 sq. ft x 75 = 1800 pounds divided by a safety factor of 2, therefore that means that your bed should support at least 900 pounds of uniform load. I don't think you will have a problem. No warranty or guarantees provided however. Worse case if it seems to be taking point loading is to thicken up the plywood.
Bingo
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Bingo and Cathy - Our adventures begin in the hills of WV. We are blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.
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