Thanks for the input, just put some klevers on it today and they have the snow rating. I’ll go ahead and grab a set of chains anyway just in case.Depends on what you do with your Jeep.
If its your DD and you need to travel over the passes in the winter, you will want to at least consider something more snow rated (K02s, Duratracs etc..). I run Trail Grapplers and while they are great in snow on the forest roads, they aren't remotely as good in a blizzard on the I-90 as the dedicated snow tires on our X3 ! As long as you have "traction tires" and 4wd you don't need chains but you are required to actually have a set if "chains required" conditions apply. Or you can just run studded tires.
Trail wise ... its rocks and trees (gotta love pinstripping). Lots of mud and water in the winter when your only real choices are the lower altitudes (everything else is snowed under until May/June) although there are some great forest roads that are semi-plowed.
Camping ... anything that keeps you dry
If you haven't done much time in Washington, it's important to know that 2/3 of the state is dry (desert-light, not Death Valley style). Don't get rid of stuff that you bought for New Mexico's terrain specifically.