How often..

on the side of the freeway in a angry panic! When they need to be replaced obviously!

Every four years.

Have an aluminum trailer and the cost to repair skin damage from a blown tire is a lot more than a set of tires.

About fifteen years ago, I had two blow outs within a month on tires that look almost as if they were new, but were five years old.
Ever since, I get new ones every four years

Guy

On autos 6-7 years

just replace the 20 month old tires on my travel trailer, because too many china bombs have just let loose while traveling down the road.

I do agree with 4-5 years assessment above.

when they need replacing, most time its around 6-8 years, but I just replaced one with a broken belt at 3 years.

Steve

I replace them about every three years. I rotate them through to my cargo trailer or car hauler.
Having a flat locally with either of them isn't as bad as having a flat on the interstate with the TT.

about every 3-4 years on the trailer. by that time they have 15-20K miles or so on them and tread is down to the point I normally change tires at.

We bought G good year 614's every 5 years and never had any issues and really no wear on the tires. Original tires were G 159's. alpenlite was a 2001 model.

chevman

We bought G good year 614's every 5 years and never had any issues and really no wear on the tires. Original tires were G 159's. alpenlite was a 2001 model.

chevman

About every 3 to 4 years. That has always been when they fail.

DURO bias, failed about 3.5 years. One blew and the rest were coming apart. OEM tire.
Denman Express radial just over 3 years. Lost the entire cap. Still held air long enough to pull over.
MAXXIS just short of 4 years and one of the tread caps was ripping off. Put the spare on and kept rolling.

My GY Endurance are doing fine so far. Had one repairable road hazard. Still have a MAXXIS spare that got me 1000 miles home that time. Hoping to go 5 years on these. (knocks on wood)