I got these
and they work well. In most of the ceiling fixtures that have two bulbs, I removed both standard bulbs and replaced only one of them with the LED bulb. I found that the one LED bulb made plenty of light, in most cases.
Some LED bulbs are not voltage controlled and this can cause the bulbs to wear out faster. The voltage in an RV DC system can go up to around 14.5 volt. On the other hand, voltage controlled LED bulbs usually cost more, and can cause RF interference. Some LED bulbs have a bluish light, so look out for the claimed color temperature of the bulbs.
There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2008 Chevy Duramax; Pullrite Superglide Hitch