Well several post on this subject for several diff RV's.
Do some searching.
First check to see if your windows are closed all the way. Some say after they lubed the tracks and the seals the noise goes away.
Other have replaced or modified the grill/radiator cover and that cured the noise.
Also check to make sure your front window seal is good. Others have posted front windshield problem.
I installed a ton of sound / Heat insulation in my Axis and it help quiet it down.... but that was mostly engine noise.
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2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor
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