On Sunday, November 24, 2019 at 12:16:47 PM UTC-5, Patrick McMahon wrote:
A few items, the tires were considered in the purchase, I think 5 years old, pressure checked, sat on concrete patio stones with UV covered when not in heated storage. They were replaced as blown with 155/80/R13's

It would be interesting to know what your tire pressure was.

Useful to know: all tires have a date code molded in.

155s are marginal. Most are SL or 79 load index and that's not enough for the application unless you are going to drive slow (60 mph). If you have enough clearance (almost certainly yes) and 4.5" rims (maybe) you could switch to 175/70-13 (same OD) which will give you a better selection to choose from. I would recommend at least 1100# load rating, at least 50 psi max, S or T speed rating would be good.

North American drivers in 2019 expect performance that wasn't on Cobra's map when your trailer was new.

T8