Thanks for the replies, I am pretty sure its wind noise because if there is a tail wind its acceptable. If there is a head wind its worse. My friend has a Columbia with a sleeper like Bob86zz4, sticks out a little over the cab, with a visor, his is quiet. I'm thinking its the design of the truck & sleeper but don't know what to try. I know its a truck but its really noisy. Thanks
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