If you want to stay with 235/80R16 Sailuns are just about your only choice as it appears this size is dedicated to trailer tires. I haven't had a failure but I need 80 series tires for clearance issues. I most likely will go with the Goodyear Endurance. They run about $150 per tire.
Since you are looking at new rims anyway you will need some that are 110 psi capable if going with the Sailuns. If you have sufficient clearance (above and between) to go to 235/85R16 then Michelin XPS Ribs might warrant a look or move into LT tires.
When running at 14k pounds and assuming 20% pin weight you are averaging 2,800# per tire. If you have a major left/right bias you could be running at close to capacity on two of the tires.