For some undisclosed reason (OK Old Age and Honesty Prevails) my E-Series Shop Manual is at home and my wife's Corolla manual is in the coach... I'll look when I get home, but comparing pix of rear drums on BatAuto, I'll give better than even odds that the "Full Floating" Rear Axle Shafts and the Hubs/Bearings do NOT need to be dismantled to get the Drums off. I can go into details of what has to happen if they DO, but other than handling bigger fasteners and heavier parts if they DON'T, rear brake work on E-350 DRW is no more complex than on most cars with rear drums.