Unfortunately it is not that simple. You likely have a couple different bulbs throughout your trailer and you will need to figure out what type you have.
921 and ba15s are common types.
Beyond the getting the proper base to be able to directly plug them in you have all different styles of lights as well. Panel type which is a flat panel with led's on it as well as many different sizes of corncob lights.
Then you get the different temperature or color of light usually measured in kelvin.
Terms like warm white, cool white also reflect the color the bulb gives off. If you like the yellowish light a normal incandescent gives off you need to look for lights with a 2700k rating (warm white).
The type and amount and type of led diodes on each bulb will determine the brightness. The flat panel type with lots of LED's are usually the brightest and the small corncob bulbs are usually the dimmest.
You will probably have to play around and find what you like the best. Fortunately they are plentiful on Amazon and pretty cheap.
Small corncob type.
Brighter panel lights....
You just have to make sure they come with bases that are compatible.