tires 225-70-15 load range e

I own a sprinter 2500 short/tall van. 2004' always bought Conti Vanco tires. 225-70-15 load range E. thats a single tire capacity of 2470 lbs. cold at max pressure. Sound easy enough? Try to find them, I got a call back today from the MB Sprinter service ctr. "None available, none...