Most RV heat pumps draw 12-16 amps when running, well within your 30-amp service capacity. However, you'll need to manage other electrical loads to avoid tripping breakers when the heat pump cycles on.
F53 inertia switch is on passenger side - either on frame rail near fuel tank, inside cab on passenger kick panel, or front by firewall. It is NOT on steering column. Look for small plastic unit with reset button. Press firmly to reset after bump trigger.
Built-in Southwire surge guard EMS provides comprehensive protection including surge, voltage monitoring, and fault detection. External unit unnecessary if built-in is full EMS. Verify yours has EMS features not just surge protection.
A disconnected ground wire in your transfer switch box is a serious safety issue that should be immediately reconnected to the ground bus bar. This appears to be a factory wiring oversight rather than an intentional configuration.
ME2012 showing 50A fault, self-test failure, and breaker trips indicates internal inverter failure or ground fault. Disconnect inverter to test shore power separately. Check all connections. Likely needs professional repair or replacement.
Girard II tankless requires different wiring than DSI tank heater. Run new 10 gauge 12V power with 30A fuse. Do not reuse old DSI harness. Follow Girard diagram exactly for proper operation.
Your Suburban SW6D water heater likely has a combustion air intake blockage or ECO switch issue preventing proper airflow. The problem occurs because the unit needs adequate combustion air to maintain the flame safely.
When your Airxcel furnace doesn't respond to the thermostat, start by checking the 12V power supply, thermostat wiring connections, and propane supply. Most issues are electrical rather than propane-related.
Your Class A RV tripping the GFCI every couple days, especially on hot days, is likely caused by your solar inverter developing ground faults as it heats up, though a failing battery could also contribute to the issue.
For your 2021 Winnebago View 24D, a Victron MultiPlus 12/2000/80 or 12/3000/120 would be excellent replacements for your fried Xantrex inverter. You'll need to rewire the connections and can ditch the old remote panel for Victron's VictronConnect app monitoring.
RV tripping home GFCI but not campground indicates neutral-ground bond issue or leaking appliance. Test with all appliances unplugged, then add one at a time to find culprit.