We've been RVing now for almost 30 years, class B owners for the last 8. Travato K owners for 3.5 years. We also have an early 2019 model year production unit.
No real need to hook anything up but your power cord at the CG. That's what you have a fresh water tank and pump for. That's the way we roll since we've had a class B, and our previous C also. Disconnecting and going are a piece of cake and fast if need be. We dump as needed, and have never hooked a hose to our city water connection.
For electrical safety, we have this surge suppressor: https://www.progressiveindustries.net
the PT-30X. Be sure to shop around. Amazon is not the cheapest place to buy this one or most any one