[MBAtarga]

What is the collective advice on utility trailer tire replacements? I've got a trailer that is about 8 years of age. Have used it periodically for Big Box store runs for lumber, landscape supply places for garden dirt, mulch, etc. Has a few apartment moves for each of the 2 kids, etc. Not any extended use or heavy weight hauling anyway. Tires are original and plenty of tread left.

So what measure should do use to replace the tires? And replace tires/wheels at the same time - or is it cheaper to replace the rubber only?

Replace after a blowout?

Replace when they are low on air?

Replace at 5 years? 10 years? Never?