Well, if I were looking to build a serial hybrid F-150 I'd consider to get hub-motors for the rear axle, and eventually replacing the stock one for another without the differential housing, and to replace the front differential with a directly-driven electric motor (because unsprung weight in the front wheels is more problematic than in the rear wheels due to the higher effort required to the power steering), leaving plenty of room to assemble the battery packs (thus improving the weight balance between the axles for higher stability) and avoiding driveshaft workarounds. Another electric motor could be set for the air conditioner, power steering pump, vacuum supply for the brake lines and to also work as a generator to feed the generic comfort features.
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