[Carl n Susan]

You have 7K axles which means you should have at least a tire with the capability to support 3500 lbs. Good luck on finding an "E" rated LT tire capable of that load. I have never seen an "E" rated LT tire with a capacity greater than ~ 3100 lbs. I assume they have a reserve capacity (margin of error) but I wouldn't be confident it is enough.

Montana ships the crappy Chinese made ST tires which are rated greater then 3500 lbs (but don't seem to last very long). The alternative is the "G" rated Goodyear G614 (made in the USA) which is a LT tire with the capacity needed. Unless you are running significantly under capacity (and you only know that if you weigh the rig) I would go with the "G" rated G614's.