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According to the specs for your trailer it was fitted with those LRD tires before the new 10% load capacity reserves were applied by Keystone. A LRE in the same tire size designation will get you above the 10% reserve recommendations.
Tire sizes/load capacities for RV trailers are determined by the trailer’s vehicle certified GAWRs. Check your certification label. Your vehicle certified GAWRs are somewhere between 4800# & 5000#. Remember, it’s not what the label on the axle says; it’s the official GAWR on the vehicle certification label.
The short way to figure out what your GAWRs are is to deduct the published tongue weight 985# - from the GVWR - 10,500# = 9,515# and divide by 2 = 4,757#, that's the minimum legal load capacity to be set for your axles. Divide that by two and add 10% and you will have the minimum load capacity for tires, using the RVIA recommendations.
Almost all of the ST tire manufacturers have added the LRE to their ST225/75R15 designated size line-up. One has added a LRF, requiring 95 PSI and new wheels. But, it’s steel cased and probably more durable.
From looking at your pictures I'd venture to guess they were under inflated or grossly overloaded. Without knowing their history you have to change all of them or risk trailer damages only your insurance will cover.
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