I am no tire expert just know what has worked for me, the way I drive, on my vehicles and uses
First not sure you are going to find many choices kevlar or not in an 18 tire with a load range of over 3700lbs. There are some out there but certainly not a lot. Toyo AT II has a couple in 18 that is 4080lbs as does their MT line but not in oem size they are bigger in one way or another ie height and or width. Cooper discoverer at3 xlt also does but same as toyo not quite oem size. There may be a few others out there as well.
I have run the Goodyear Silent armor pro-grade which are kevlar and liked them but they really pared down the size selection and had to quit running them as they no longer made the size I needed and still don't with my newer truck.
I then tried the Goodyear Adventure with Kevlar pro-grade. The pro-grade does come with the severe snow/three peak rating as well as little higher speed rating compared to the non pro-grade version in my size. Their max rating is 3640 in 18 inch. If you are willing to go to 20 inch they do have a couple at 3750 lbs. In any case the Adventurer pro-grade has been a great tire for me. It does well on road, off road, rain and snow. If it lacks anywhere it is in the mud but I have yet to find a great mud tire (well tire I am willing to buy as I am not willing to buy an MT I feel I give up too many other things I like in a tire but again that is for my needs and uses) for an 8k+ lb truck and over the years I have tried quite a few. It is one of the best tires I have used on my trucks for the last 500k miles. I am now on my 3rd or 4th set of them and none have disappointed me.