I believe the e-brake is not cable driven, as there are no cables to the rear drums. When I looked underneath there's a hub and "brake shoe" near the transmission that appears to lock the driveline.
I'm not in a financial position to buy a jack - hence, why I'm trying to sell the truck for .40 on the dollar

So, I guess the shoes are rusted - or the pistons on the wheel cylinders are stuck open by rust or gunk...
Oh, yeah - the master cylinder was nearly empty as well...hmmm would opening the valves on the wheel cylinders maybe make the brakes collapse?