Solar wire/cable routing options on my 2005 Four Winds 29Q

I'd think that using a fitting or a box on the roof would be easier to seal than just a hole with wires through it.

Bulkhead cable fitting, there are many different types.

Array combiner box. Depending on how you are wiring from the modules to the controller, you can use a combiner box or an all-weather utility box with weatherproof fittings. I made my own DIY box that is similar to the one linked above.

Good luck with the installation.