Originally Posted by ak5thwheeler
According to your tire load placard it's pretty safe to say that your trailer's vehicle certified axles have 6000# GAWR, each.
The OE tire size - ST235/85R16 LRE will provide about 22% in load capacity reserves at 80 PSI. Brand selection is a personal choice.
Check your current tires date codes on the tire sidewalls. If they are more than 3 years old, I'd change them just because I wouldn’t know their maintenance and usage history.
Tire date code: 43 is the week of the year made and 09 = 2009.