I have a 2018 THOR ACE 29.3 and had the front whistling. Called THOR they acknowledged that it was the front grill and that they would send a replacement. New grill completely solved the problem Don't know why they said the 2018's don't have that problem Mine did, and the new grill fixed it!!!
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2018 THOR A.C.E. 29.3
Cmax Energi Toad
SumoSprings, Safety Plus
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