You want to consider how much light you’ll need and where to place the new fixture. Be mindful of slides in your RV and how opening and closing them will impact your new light fixture.
If the voltages aren’t compatible, you may direct power to the light socket, but you’ll be left in the dark, as it won’t illuminate the light bulb.
This helps ensure there’s no power running to the light fixture you’ll be replacing.
You may be unable to use the existing holes. Like most cutting projects, starting small and working toward larger holes is better.