What do you mean by rear door sections? It was not until the '67 to '72 body that Suburbans were more than two door trucks.
The '47 to '54 body Suburbans and panels are all two door trucks, but they are also the only one that really matches the look of a '52 GMC.
Somebody is going to pop in and describe one they've seen, but if its not a recent custom its a coach built custom, not a factory truck.
I'm not suggesting you can't use Suburban parts to accomplish what you want, but its more complicated than simply grafting the back of the Suburban body to the COE cab. Making it a four door means figuring out how to add that second set of doors, and custom building doors that look like as that second set.
Another thing to think about is wheel base. The shortest 1-ton dually I've seen had a wheelbase of about 125 inches. The stock Suburban has a wheelbase of 116 inches. Using a COE cab instead of the original front clip shortens the body's wheelbase to under 100 inches.
Since most duallys are extended cab, or crew cab, most have 133 or 155 inch wheelbase or something similar and even longer.
This is a case where measuring twice or twenty times makes a lot of sense before you start cutting on things.
As of today I've cut up one COE and two panel trucks, and I have one more COE, a 1-ton panel (137 inch wheelbase) and a Suburban, all as part of my project to build what I'm calling a COE Suburban Cargo. I don't want to discourage you from your project, but rather to suggest you spend some serious time thinking and measuring before starting.
And post pictures once the work begins.
