Not generally important for a hole in the roof that will be covered with dicor sealant or silicone sealant but important when drilling a hole all the way through the wall.
Where to drill through motorhome roof.
You want to avoid a wire coming through your roof and end up dangling from your ceiling so try to line up your exterior opening with an interior wall inside of a cabinet under a bench or bed etc.
Test mount your device with only 2 screws to make sure all functions correct and fit.
The roof outside will generally require a flat spot for the gland.
Use a cable glad box where you have drilled the cables thro the roof and lots of sealant.
Set back in place and pencil mark outline.
Drilling all the way through a wall or ceiling will cause some level of splintering or otherwise a rough surface around the hole exterior.
Whether you drill from the inside or outside is not important although once having checked the geography drilling from the inside is preferable although not always possible as the hole will be exactly where you want it to be.
Therefore i had to drill a hole.
Next drill all holes and then remove and clean roof and bottom of device.
Look in all areas along the edge of the roof inside the van sometimes cables come up the wall and into the roof and across for lights etc.
Cable access hole through rv roof how to solar duration.
Also consider making a pad or nest with decor or true rtv.
Take wire to probe through hole to confirm clearance and make sure nothing there.
Rather than drilling a hole and schmucking a big messy glob of sealant around it you can create a weather proof entry port.
I know i know i said drill a hole if you have other access like a rooftop refrigerator vent by all means use it but i did not.
You will need to drill a hole in the roof of the rv large enough to run the wires inside.