Good advice above. I am going to guess this is your first TT.
Battery Charge Indicator
As soon as you plug in the TT into the electrical post the battery indicator light will say you have a fully charged battery. This may not be true as the indicator it is looking at the voltage in the feeder line. Once you are plugged in the converter charges the battery, with an elevated voltage, giving you a potential false reading. To get a true reading you are best off using a volt meter, with no load on the battery (either discharge load or charge load).
When you drain the black tank, at the end of the weekend, add a few gallons of water into your black tank, some people will then add the toilet chemicals or another mixture. We add PineSol (¼ to ½ cup). The idea is, as you drive down the road you are washing the inside of the tank, knocking down TP (toilet paper). I know a lot of people who use this technique and no one seems to have any issues. If we remember, before we leave to go to the CG we add the toilet chemicals so it can mix into those few gallons of water we added when we left the last CG.
Sometimes people will also add a 10 pound bag of ice down the toilet right before they travel. The idea, is the ice will knock the crude off the walls and sensors. I have never used this technique as I have never had an issue.
The only time my Blank tank is ever dry is during winter storage.
One last thing, before you leave to go home at the end of your adventure, you need to dump your tanks. I strongly recommend spending a few minutes at your site and fill your tanks (especially the black tank) ¾ full or more. This will help fully drain the tanks. Drain the black tank first, and then use the grey tank to flush out the sewer hose. Once done this is a good time to add that few gallons to the black tank for the drive home.
Best of travels.
By the way I am jealous I hear we have something like 6-18” of snow coming Sunday/Monday