Heybro your rear axle rating is a conservative “limit” of the Max total weight for it to carry. Vehicle weight (2500lbs giver take) and all payload.
Yes LT tires can add even more stability, but 50psi makes them quite stable. Look up a load pressure chart for your tire size to see the capacities at different pressures.
Don’t get too caught up with the condescending responses.
If you have more questions, PM me. I’ll answer them. Some Folks here will argue with each other and likely confuse the issue more for you than help.
Btw what jimlin said is correct, however I have no issue running E load tires on half tons when they may be needed or just for longer tire life.