The OP does not have a diesel didn't buy one on purpose. Sway from wind has never been a problem nor has power. However I can see power being an issue with my gasser bucking a strong head wind and having to deal with decent sized hills. Just wondering if the diesels struggle too or its business as usual. Until this summer all of my towing has been in the flat lands of Minnesota where wind direction is predictable and hills are relatively mild. And the hills we have are few and far between. But just curious how the new diesels perform with a large 12k lb full frontal 5th wheel, a strong headwind and long hills?