Yes sir, you are correct .. I now have the D rated tires in 13in ..but was looking to go to something in the 2000 lb range. A 14 inch rim has more options and higher load ranges.. When you think about it my trailer on the road is about 3300-3400 lbs.. The tires are rated for approx. 3500 lbs together. Seems close as when you are in high heat and pot holes etc the tires seem borderline. The 14 inch adds about an inch to overall diameter ..which adds about 1/2 inch less wheel well clearance.Not that bad ?On a single axle you need a good safety margin as a blowout can be damaging.