The Strange aluminum drop out is stronger than a factory iron one. With the smallish tires, light weight and small motor, the aluminum will be more than up to the job. The reduction in unsprung weight and cooler running temps are an extra bonus.
Quite a few short course trucks run the strange aluminum case, not the OEM style but the larger bearing unit. "ultra case" I think. I can only think of the mileage being the reason they can run it yet not desert trucks.