Wheel Bearing follow up

As a follow up to Poppy's 5th wheel post on greasing wheel bearings, my question is how often do you grease your wheel bearings.
My Dexter book says 12 months or 12,000 miles.
I think that is overkill. I pull my 5th wheel to Florida & back each year and maybe another 1,000 miles = 3,000 / 3,500 miles per year. I repack my bearings the old fashion way even though I have the bearing buddy's but not every year.
If tractor trailer drivers greased their trailer bearings every 12,000 miles they would be doing it every month or 6 weeks and I don't think they do that. I know they are different axles, weight etc, but still trailer bearings...
So should I change my thinking and follow Dexter or are they just CYA or CTA (C their A)

I just did mine for the first time for this coach. Five years and they were in perfect condition. If you travel a lot of miles once a year is probably good preventative maintenance. If not, then maybe every two years. I plan to skip the EZ lube feature in the future as it puts a lot of grease in to clean up at bearing clean and repack time and probably is unnecessary for most RVers. Carry a spare bearing, race, seal, grease and the tools to fix it on the road if you have to.