Common myths about RV maintenance

A few myths I hear constantly: bigger fuses don't fix 'weak' circuits (they just delay the actual problem and add fire risk), running your generator monthly 'to keep it healthy' without load doesn't really exercise it properly, and lithium batteries don't need the same maintenance mindset as lead-acid (no equalization charges, different storage voltage recommendations). What's a maintenance habit you've heard that you're not sure is actually true?