About to drill a hole

I've been driveway camping for the past week, due to extreme humidity in the area. I've been emptying the 2 gallon bucket on my dehumidifier twice daily,..

BTW.
Putting RV insulator pillows in all your roof top vents makes a BIG BIG difference regarding heating and/or air conditioning the RV.
I use them both the the winter and summer.

Those thin plastic roof top vent covers are NOT sealed and cold comes in in winter and your furnace heat goes right out, and in summer the heat comes in and also allows the humidity in also.

Putting those in your roof vent openings will cut down how much humidity your are getting inside your RV.

Buy the RV roof vent inserts with the white cloth material on one side and reflective silver on the other side.
Do 'not' buy those rubber ones.