How often do you replace boat trailer tires?

Single axle? replace them

Double axle, I'd go another year.

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Watch very carefully for dry rot on sidewalls.

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I've got an 06 Silverado that I've replaced tires on twice and both times not because the tires were worn, but because of dry rot in the sidewalls

I've only got just over 75K on the truck now and the truck is always exposed to the elements since I only have a long driveway.

Check the mfr date. A lot of times boat trailer tires will sit for a while before being installed. Dry rot is the enemy.

Year mfg is 18

Coolest thing I’ve seen was backing boat up and an entire wheel/rim just popping off and rolling 100ft away in parking lot

Many automotive experts consider 6 years as the safe life of a tire - article on the subject. Old Tires With Good Tread I change my automotive tires at 6 years regardless of the amount of tread remaining as a safety precaution for myself and others on the road.

Since pulling a boat trailer usually involves a lot highway driving at higher speeds, and not just putting around town, not a bad idea to replace tires at 6 years of age (date of manufacture). And don’t forget the spare.

If you run the cheap trailer tires I wouldnt go longer than 4 years.

A good set of name brand tires do last a longer. If the boat has any weight or you tow at interstate speeds then also spring for the name brands. A lot less blow outs with them.