My 5th wheel has two rockers with a table between them with a lamp mounted on the table. This fixture is 120v which means we'll rarely use it since we usually dry camp.
I brought 12v close by and added an outlet. I found a 25watt (equivilent) LED bulb on Amazon which draws just over 6 watts and fits into a standard 120v light bulb socket. All I had to do was replace the lamp plug with a 12v plug making the center contact on the bulb socket positive.
The bulb was $22, outlet $8, plug $6 and two hours work.
Works well either dry camping or hooked up to power. I do have a 60 watt 12v bulb to replace the LED while hooked up to power but remember that that's 5 amps alone on one circuit.
2012 F150 F/X 4, 6cyl EcoBoost with Max tow pkg
2013 Rockwood 8280WS 5th wheel
2006 Sunline T1950
2004 T@B T-16