Sorry to hear about your wife's injury. I hope that she recovers quickly.
We leave our water heater on all the time. If we leave the CG for a while, we turn it off. We turn our water pump on as needed. When connected to the CG sewer, we wait until the tank is reasonably full to open the valve. We have heard of some sort sewer fly that you can get in your tank if it is left open all the time. You will likely manage the weekend without having to empty. It depends on how much waste goes in your tanks.
Since you are not travelling this year with the TT have you considered staying during the week also and travel to work from the trailer? You have a seasons pass and that way you get to enjoy your trailer more.