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Yep, that's the dilemma. Although even with a local sale, you still have to transport or make trips.
You could ride it home with a different plate, or no plate, or beg to borrow the plate from the PO, or any of a hundred other legally questionable moves.
I hear some rent the truck from Home Despot. But I bet that gets spendy fast too unless it is really local. And I imagine it is a PITA to load into those tall trucks.
Myself, I borrow a trailer from family. If I didn't have a trailer to borrow, I'd have bought one by now.