I’ve painted all of the paneling in my older double wide probably 5 years ago. It had dark paneling so I wasn’t sure if I should prime it. I bought one of those small samples of paint sold in Lowe’s. I figured it was worth the investment so I could find out about primer. It went on well and it covered.
We used a primer first and then painted it. Turned out perfect and we love it!
Thick nap roller.
There are lots of posts on painting paneling here: