New tire question

[rverdlm]

I know that some of you have had tread separations with your trailer tires. My question is; Do you have any idea how many miles it takes from the time some separation/cracking is visible and when the tread came off? The reason I ask is that we just successfully completed an about 4000 mile trip. Since we only travel about 300 miles a day and we stop often (at least every hundred miles) is it worth doing a careful visual inspection of the tires for cracking at every stop? I've always done a quick visual and temp check at every stop, but on this trip I looked at the tread edge carefully on every stop also. I'm hoping that this would prevent the tread coming off at speed with the resultant damage.