It does not get much better than this kit, then add 1 more panel and the mounting hardware. Has the controller and all.
Amazon's Renology 100 watt solar kit.These panels are narrow and long... Great for most camper roofs.
Take the dimensions of these panels, make 1 or 2 cardboard templates and position them on your roof and see how they will fit.
Here is my panels mounted so I can get around on the roof. These panels are close to the dimensions of the Renology's.

Jim