To say that LR E tires "simply won't work" is absolutely wrong.
They WILL work, but the tire capacity becomes the critical measurement in the suspension load capacity. His 7K axles now have a maximum capacity of 6,048 pounds. Just like those of us with 6K axles.
The lower rated tires are not going to "hurt" the capacity of the axles.
You now have to be very careful about loading the trailer, but that doesn't mean that it "won't work".
I do agree that it doesn't make much sense to reduce the capacity of the suspension, but it could be done without damaging the axles.