Replacing tires -- in pairs?

[FrittSkritt]

I have a 2009 Kingston 2 horse BP w/ dressing room. Currently has Kenda Karrier Loadstar ST 205/75/R15 tires, one of which has a nice puncture wound. I have the spare on right now, but need to replace the original tire since they were unable to repair it.

Do I have to replace trailer tires in pairs, like you would on a car? I’ve searched around and can find the same brand/make/size, but mine say “5 ply” on the sidewall, but I’ve only been able to find 6 ply tires in the same type. Is it considered sacrilegious to have two 5 ply tires and two 6 ply tires on the same trailer?

Paging Tom King…

[OTTBs]

Any reason you can’t just use the spare, and put your new “oddball” tire as your new spare? Although if your other tires have significant wear, I would replace in pairs.

Many on here will tell you if your tires are over 5 years old, you should replace all of them. As for me, my first set of trailer tires were 10 years old when I replaced them.