One of the members of our Kentucky Unit upgraded his 1992 trailer to 16" LT tires. No problems. I also have a 1994 Classic 30 but luckily have not had tire issues yet, still running 15" tires. I regularly inspect them, maintain the tire pressure and take the weight off during the off season.
I certainly understand your frustrations and don't blame you for wanting to change tires sizes.
Steve, Christy, Anna and Phoebe (Border Collie)
1994 Classic 30'11" Excella - rear twin
2009 Dodge 2500, 6 Speed Auto, CTD, Quad Cab, Short Bed
Hensley Arrow hitch with adjustable stinger
WBCCI # 3072