Rather than drilling a hole and schmucking a big messy glob of sealant around it you can create a weather proof entry port.
Where to drill through motorhome roof.
Drilling all the way through a wall or ceiling will cause some level of splintering or otherwise a rough surface around the hole exterior.
Therefore i had to drill a hole.
Test mount your device with only 2 screws to make sure all functions correct and fit.
Also consider making a pad or nest with decor or true rtv.
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.
Drilling holes into our rv roof to run solar wires down inside solar vlog e6 full time rv living duration.
Inside a cupboard or adjacent trunking.
Take wire to probe through hole to confirm clearance and make sure nothing there.
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.
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.
Set back in place and pencil mark outline.
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.
Use a cable glad box where you have drilled the cables thro the roof and lots of sealant.
The roof outside will generally require a flat spot for the gland.
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.