Hello, got our 2019 Frontier Crew Cab SV 4x4 with the long bed yesterday and took home our 2021 CrossRoads Zinger Lite 18RK today. The trailer weighs 3500 lbs dry and I have the WD hitch with spring bars and sway control arms. The truck does ok but won’t stay in overdrive for very long at 60. A slight hill and I’m doing 3000 rpm and watching the gas gauge drop. On a flat road with no headwind, it’ll turn at 2000 rpm. Stability is ok but the big rigs will bounce me around a bit. What kind of gas mileage are you guys getting.