That's what I found where some of the road dirt get's in and water heater compartment. A appears to be a daunting task to really seal them well from the breezes. Since I have a empty battery box I think I'll put a 12 volt
high volume muffin fan in there and use the rest of the battery box as a HEPA filter, keeping a positive pressure inside the AS while in tow. It will take a while to engineer and test but I'll post the results for everyone.