My wife was a processional painter long ago, and she wanted to paint the interior of my old dark wood drab camper... I was skeptical but turned her loose to do as she pleased.
She gave literally all of it a scrub and good primer and did aqua tone colors, a light teal base with an aqua metallic trim that looks amazing and has held up well for several years so far.
Don’t be afraid of a little color. The transformation of mine is incredible, everyone loves it.
She did the full “glamper” treatment with matching curtains and upholstery and bedding.
Go for it. Campers, especially older ones, come so drab and ugly.