Before I retired, I would crawl under the '48 in the evening and place the heater on the pan. I didn't want to crawl under the truck in the morning dressed for work so I drilled a hole in a 2x2. I could slip it onto the handle, take off the heater with a twist and keep clean.
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Magnetic Heater Remover.
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1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.