mor/ryde wet bolt lube?

I do mine at the beginning of every camping season - which is probably about 4K miles.
In truth I don't think it needs it that often.

Yearly at a minimum or before a long trip then afterwards if more lengthy travels are expected. 3-5000 miles is a good rule of thumb for me. Dexter Axle, who probably make all wet bolt kits regardless of name, says 3 mos. or 3,000 miles and as always, their recommendations seem a bit CYA conservative

I lube them prior to our travel season and then about midway. We travel from April thru November. I use a high quality EP grease- not particular to brand. May be overkill but grease is cheaper then parts and labor. Present trailer is 13 years old and suspension is original except for shocks.

Yearly or before a long (2500 mi +) trip.