I ran Marathon 6 ply tires on my trailers until they moved production to China. Since then they can't seem to make up their mind WHERE they want to produce them and that moved me to Maxis. AS long as they maintain their excellent reputation there is no reason to move back to an unknown (to me) brand again. As for your load range C tires I've towed over 80,000 towing miles including an Alaska trip and travel through 49 states and have NEVER had a tire failure. My trailer is nominally 8,000 lb. Tires SELDOM blow up due to overloading (I've seen several that blew up while hanging on the rear bumper). There are ALSO many posts on the forum about those who have oversized their tires and still having blowouts. BETTER tires are the answer, not bigger ones. Good luck with your decision / Skip