The 2024 model year was the last for the supercharged 6.2-liter V-8 known as the Hellcat, at least in the Ram 1500 TRX. The 2025 1500 RHO has arrived to fill in for the TRX. The new truck is essentially the TRX with its Hellcat V-8 replaced by Stellantis’ Hurricane twin-turbocharged 3.0-liter inline-6. But with only 540 hp, the RHO’s power rating…