Rear window

For those with the Viking VI, or anyone who knows, is there anything to put directly behind the front seats to act as a shield for the dust coming back around into the cab? We do a fair amount of gravel roads and the dust can get overwhelming at times. The 3 seat wouldn't be an issue with a rear windshield, but a little concerned the 6 seater and keeping a good amount of dust off of us in the front seats.

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