Absolutely replace those tires! I to have a 2013Jayco that had Towmax tires... in my opinion Jayco was negligent in placing those tires on my trailer - they were borderline overloaded from the factory ( load range D). My first issue was a flat on the way home from the purchase. Luckily I stopped at a rest area and my walk-around revealed a slack tire. No big deal, any tire can pick up a nail... I had the correct tools, so I was on my way in 15 minutes.
1 year later... riding along at 60 mph (I never exceed 60) my first blowout. $2000 total damage to fender and sidewall, Insurance covered the damages minus $500 deductible. Original tire had been patched and was placed back in service.
360 days later another blowout... major damage to other side of trailer. Different tire! Put the spare on (Maxxis load range E) and on we went.
10 days later - 3rd tire blew! On the same side as thee previous one... insurance treated the damage as one incident $2200 damage covered except for $500 deductible.
This time I had no spare - limped home on a used P tire from a local gas station!
Three blow-outs in within 3 years of tire mfg. caused $4200 damage. I wrote a letter to tow max requesting reimbursement... got an offer for $25 discount for each tire toward purchase of new-haha!
Wrote to my insurance co - they decided to pursue Towmax and seek recovery of their costs... 18 months later... I got a check for $1000 refunding my deductible from my insurance co!
Sorry for the long post, but, this is my experience with Towmax - I purchased Maxxis Load range E’s to replace the originals. No problems yet.