Here is an interesting towing range test of Rivian R1T and 2022 Toyota Tundra with a small trailer in slightly cold weather conditions.
The Fast Lane Truck already conducted a pretty extreme towing test with the R1T in January, but now it's something probably more appropriate/typical of what Rivian drivers would do.
The trailer is small and aerodynamic, with a weight of under 2,000 pounds (907 kg) and no trailer brakes, but with 35" tires, which adds some considerable drag.