#2 Trailer Replacement tire size?

A little margin on the tires sure doesn’t hurt but keep in mind that the rest of the #2 gear (namely the 1” spindles/hubs/bearings) have a 2000lb weight capacity. Tires rated in the 1100-1500lb range should be fine- most 12x5.30 should do it.

Not sure what lug pattern has to do with tire choice... but plenty of 4-lug wheel options in 12” and 13”. The 13” tires are VERY tight on original wrap fenders prior to ‘72-73, even with new springs- so I recommend sticking with 12” to prevent rubbing. And obviously don’t overload the trailer as capacity is marginal.

What would be wrong with these- link
Back in '11 TRbenj had found some tires at Discount Tire Direct they were 145R12 with a load rating of 1520 each and were 52.00 each. A couple of us bought them and soon they were sold out never to return. Mine have been trouble free for over 6K miles. I had just repainted my original wheels -

Same here. 530-12 on mine.

I'm looking to replace wheels and tires on my trailer for my 72 mustang as I have mismatched wheels/tire sizes right now. The one original wheel has a 155R12 car tire and the other one is a 5.30-12 trailer tire that just looks to small (this wheel/tire is probably an inch narrower than the original). Is there a go to wheel and tire you guys are putting on these trailers? Any help is appreciated.