I tow a 30 foot travel trailer that weighs 7500 lbs. I tow all around the southwest where steep grades are common. I use engine braking on my ICE truck on steep downhill grades to save the brakes from overheating. While the Rivian’s tow capabilities are impressive, how will it handle steep downhill braking with no engine braking? Regen braking in my experience can only absorb a limited amount of energy. A large heavy travel trailer pushing you down a hill needs a significant non brake slowing force to keep the brakes from overheating. How has Rivian addressed the issue of towing heavy weights down steep grades?