Trailer Tires

Anybody having any luck with trailer tires ?I need to replace mine. This is my 2nd set in 4 years.215-75R-15.Just had one seperate and peel the tread off like a re-cap.My guess-ta-met is they have less that 30K miles on them.I even cover them when the trailer is parked.The first set that came new on the trailer seperated within the first year.:wack:Any good brand known ?