I have LT tires on our Elite I, and run at 70psi. I've got no deep knowledge on the tires, I run at 70psi based on past info from this forum.
We've only owned ours for 1 1/2 years so we're running on the tires put on by the previous owner (Michelin LTX). We've had no problems at
all, but no rough road traveling (lots of back highways if possible). And we're still weekend only unfortunately, looking forward to some longer trips.
Might consider the ST tires when we have to change, but that'll be another year or more I think.
And @Ron and Phyllis, glad to have some other Elite I owners around.