My Outdoorsman (got a month ago) actually came with Champiro Ice 2 WINTER tires (E load rating), so I'm gonna need to buy summer/all-season tires in not too long. In Calgary, Costco has the BFG Rugged Trail T/As as the cheapest option - any thoughts on these? Also, is "E" load rating sufficient? I plan on towing an RV trailer (5000 lbs) this summer for the first time...