I wish it were that easy. I am in a situation many find themselves in. Alum boat and chewing up tires. Not a lot of choices for 13" tires, esp if you want radial. I am of the belief that a lot of the trailers under these alum boats are not built for the boat they carry. My Fisher hull weighs 1100, another 325 for the engine. Add 10 gallons of gas, 3 batteries and all my fishing crap and you have an over weighted trailer. Those C load tires on those 4 1/2 rims can only do so much. And oh yeah, my fishing hole is 40 miles down the parkway, speed limit 70. How fast am I supposed to drive? Just the bounce of the ride, even if I only go 60, will work on your trailer/tire set-up, setting you up for failure somewhere along the way.