The power train is the most expensive and largest part of an EV. So stuffing it info a vehicle that isn’t meant for it is pretty tricky. It’s easier if you sacrifice the truck or back seat for batteries, but it’s still hard.
So it seems, but aren’t electric motors way smaller? Heck Ryan F9 fits inside a truck’s engine space (but i’m trying to make a point for any vehicle, yes).
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The electric motors can be pretty tiny. The batteries are generally the packaging problem. They’re heavy and lumping them all where the engine would have been in a vehicle will have severe impacts on weight balance and handling. Distributing them is best, but requires space that vehicles need to be designed around. You can put some batteries in the engine compartment and some in the trunk to keep things neutral, but that still requires giving up storage space and requires running a high voltage line throughout the vehicle to connect the battery banks.