Depends on dryer voltage. 120V dryers work on 30 amp with load management - turn off AC while drying. 240V dryers require 50 amp service. Check your specific dryer model specifications to confirm voltage requirements.
While there's no direct plug-and-play replacement for the Atwood GC10A-4E with a gas-only tankless unit, you can upgrade to dual-fuel tankless heaters like the Girard GSWH-2 or Truma AquaGo. These maintain electric capability while providing instant hot water and better efficiency.
Motoraid heat exchanger uses engine coolant for coach heating. Maintain coolant level and inspect hoses. Drain when winterizing.
Your RV sewer hose will likely freeze at 25°F, especially with the uphill section that creates standing water. The two-inch rise at your hookup point is particularly vulnerable to freezing.