the breakdown The AEV FX370 is a Ford Super Duty truck modified by AEV for greater capability and performance. AEV made news recently when it announced that it's building parts for the Ford Super Duty. The mighty AEV FXL sits on 40-inch tires and presents as an overbuilt beast for demanding customers. But the 37-inch BFGoodrich KO3 tire used on the AEV FX370 is a serious amount of tire. Buying a complete package, such as this FX370 setup, would give your Ford Super Duty a serious off-road capability boost—making it the perfect platform for a hardcore overland build.