All you need is a 12V LED bulb that has dimmable diodes and a 12v device to dial voltage up or down. Avoid the tacky self contained battery stick on stuff, do you really want to go around and turn off 20 lights at bedtime?

So a bulb that fits the existing fixture, I would have to look at it to know which base is best but this has the right specs: https://www.amazon.com/Letaclanic-Lighting-Dimmable-Equivalent-Silicone/dp/B08K8BSJ8K That has the driver in the base of the bulb so you can just hook right up to the power source.

And then reroute the existing switch wires to one like this: https://www.amazon.com/Halogen-Incandescent-Dimming-Control-Lighting/dp/B089N9WYGT/

If you really wanted to you could leave them on the existing on/off switch and splice in the control box of a cheap set of dimmable rope lights for use with the remote. I wouldn't go this route with a dimmer switch though.

Not all LED's are dimmable, and you have to make sure everything is rated for 12V and not household. I doubt the RV mfgers are spending extra on dimmable LED's and then not selling that feature, but it never hurts to look up the model number on your existing bulbs first. But other than that, there is not a ton of work to converting your existing LED's to dimmable.