I installed two 12v
spotlights on the valances in my trailer; one over each of the folding tables. This prevents trying to work in my own shadow. The spotlights are bright enough that no extension arm is needed.
The bottoms of the overhead cabinets are double, with a wiring channel between the layers. I popped off the screw covers and lowered the outer bottom far enough to reach the wires inside. Some crimp connectors and I had working lights.
The spotlights came from Camping World. They are a bit pricey at about $33 each, but quite attractive. There is a pushbutton switch on each light fixture, but wires could be run to a switch elsewhere.