Very common.
looking at your sig shows a Keystone Alpine 3600. Keystone web says the trailer has a 15k-15.5k GVWR with ST235/80-16 E at around 3500 lbs per tire. IMO your trailer has 7k axles.
Some folks move to a Goodyear G614 LT235/85-16 G load range at 3750 lbs capacity.
Some also moveup to 17.5 " wheels and commercial grade LT tires in the 3500-4000 lb range depending on actual tire size.
Some folks are using the Sailun S637 all steel commercial grade LT235/85-16 G load range at 3750 lbs capacity. There is a current thread on these tires on one of our forums. Maybe someone can link you to it.
I wouldn't put any brand of ST tire back on a trailer that heavy.
