Have a 21' Wellcraft cuddy and a tandem axle trailer. Recently had a blow out on the old Marathons (they were pretty dry rotted) and new need 4 new tires. The old tires were 175/80R13's load rating "C"; does this sound adequate? I know Nanco tires are Chinese, which I'm not real crazy about, but they are significantly cheaper than the Goodyears (which I have heard mixed reviews on). Searched but didn't see a whole lot of reviews, any opinions in these Nanco's?