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One of the most major aerodynamic needs of the Suburban is more rear taper. A boat tail could be added to the rear of the vehicle, however the Suburban is already fairly long with significant rear overhang so that may not be the best solution. The shorter Blazer/Tahoe/Yukon/Denali could probably better adapt to this type of solution.
The more extreme solution to rear taper on the Suburban would be to boat tail the rear cargo area of the Suburban. This obviously would be a major undertaking and could potentially disrupt the utility of the vehicle.
Some have done what is known as Avalanche conversions, which is to basically turn the suburban into a crew cab truck by chopping the roof off the cargo area and grafting in pickup truck body panels and parts. It would not be unreasonable to think that for a similar level of work you could create a hatchback Suburban, which would basically be an Avalanche conversion with a sloping bed cover. This would seem to be a better option with a rear tailgate.
Alternatively the rear of the vehicle could be tapered by changing the rear roof pitch over the cargo area, but not removing or hinging the roof. This would decrease the size of the opening in the back of the vehicle, and would seem to be a better option to resize and keep the rear barn doors.
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