Hi there experts! I live in Western Washington and I have almost 50k on the tires that came with my truck (almost all of that is towing/hauling). Currently they are Continental M+S tires that I want to replace as they do not perform as well as I think they should. I've talked to 3 different Tire places (Costco, Les Schwab, and Discount Tire) and all three recommend different tires. I looked at tirerack.com and Consumer Reports and some of the threads and reviews there, but I cannot seem to combine the information to get a good readout on what would work best for me. I have a '08 Arctic Fox 10' cabover camper that I haul with the truck quite a lot (~5k-10k miles a year for ~20-40 nights) and a 25' Bayliner Boat that I tow with it to Eastern Washington at least once a year in the summer (with the camper on). In the winter we camp at Stevens Pass and so the tire needs to work well in the snow and ice with the camper on as well. I am really hoping someone can give their recommendation for me. I think these are the choices (but I'm not opposed to any new types). The size is 275/70/18 E Range. I want something that will last 50-70k miles that drive well (not spongy) and work well in ice/snow when I need them to. I may be asking for too much?!

Choices seem to be in no particular order:

Michelin LTX A/T2 (Costco)
Wild Country XTX (Les Schwab - whom I prefer just for easy access for rotations, flat repairs, inflation, etc)
Cooper Discoverer ATR (Discount Tire)

Any help or advice is appreciated! If I left out an important detail, please ask!