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.
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.
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.
Motoraid heat exchanger uses engine coolant for coach heating. Maintain coolant level and inspect hoses. Drain when winterizing.