How many of you grease your own trailer axles?

All of the previous recommendations are good. I was negligent in my trailer maintenance and burned up a bearing on my enclosed trailer last fall on the way to a race. Luckily it happened near my sis in laws house and I was able to limp there. First time it happened in 23 years of owning the trailer , I had to replace an axle and I had all new bearings and brakes done. I now will check the grease several times a year