If the vehicle comes with P tires and you want LT, then the next logical step up would be to a "C" rated LT. No need for an "E" rated tire unless it is the only one that is available.
I put "C" rated LT's on my dodge van and it was the best thing i did. P rated tires are a compromise of smooth riding and load carrying. Most people want smooth riding untill they realize when they load up a truck/suv and it sways when going down the road that they are looking for an alternative.
I just put General Grabber HT's on my Excursion. Very good tire with a good hwy tread and it is a low rolling resistance tire.
Good luck!