I would replace NOW< why risk a failure and the inconvenience of changing road side, not to mention the safety of it!
why wait, to save a few penny's on some MILD wear and tear from low summer use?
there tires, there made to be replaced and why they come with dates on them, my rule of thumb is I replace my trailer tires , all the more so on these smaller one,s that turn at HIGH speeds to keep up with the bigger one's on my truck!, as I might be prone to over speed limit speeds now and then LOL
I rather not have tire issue's in season or out of season, that try and get the most life and miles out of tires
flats suck, blowouts even worse!
this has been the best place I have found to get tires online, too, if you care to look!
https://recstuff.com/trailer-tires-...range-c-bias-ply-trailer-tire-kenda-loadstar/
I would also highly recommend while your looking at trailer, inspect your trailers axles, the mounts on the axles where they bolt to frame and the frame and the spacer between axle mounts and frame, as they too are wear and tear items , that fail faster than other parts on trailers!
its something many forget to look at! yet are on every aluminum framed trailer!