Promise this will be the last question: I found a 265/60/18 and a 265/65/18 . . . other then the load index going from 109 to 112 (seems very good . . .) how would the hande/respond differently?
You will not be able to notice that sidewall difference. More important would be the actual casing design. If the tires are truly equal, just run the one that suits your NEEDS not what you think will be some immeasurable handling characteristic.
Now think about this point - what are your NEEDS?
If you are going off road (which can mean many things - is it crazy trails, mud, snow, deep snow but on what would otherwise be basic gravel road/trails? etc)
My 265/65x18 tires rub into the thin ARB bumper fender side panels with no articulation when I turn full lock. They rub the rear wheel well front inside face when at full articulation, but only rub, they are shredding it because when in that situation, i'm not flooring it, I'm being slow as she goes.
now, if you want the most deep snow ability, then go with the narrower width or height. A 60 profile may be just enough to give you no issue with real chains (like Rud 4x4)which in deep snow would make the lr3 nearly unstoppable.
The speed rating, how fast do you plan to drive an lr3....?
I like the tires I use also because their design and rating allows higher air pressure which helps the highway speed handling with it being so heavy. That difference you can feel. 42 psi vs 60 psi makes a big difference driving at 70 mph through canyon roads fully loaded but these E range tires are rated for 80 psi.