Unloaded Weight 4326
Cargo Capacity 2274
When I try to figure what my trailers need for tires, I don't take the tongue weight away from what I calculate the possible load is on each axle and tire. If you put the Kumho's on at 2150 lbs each, that gives a 8600 lb. total tire capacity, or 500 lbs/tire extra. Sounds about right to me
Your tires total 7040 lbs. capacity, or approx. 110 lbs./tire extra.
Load range D is quite an improvement.