To scrap an automobile here are the general rules:
1) must have the title (there are legal workarounds but its a headache)
2) remove the toxic stuff (gas tank, batterry, fluids) leave oil pan tranny pan off for inspection
3) remove radiator, cat converters. These sell @ scrap for ALOT. On the radiator cut the core out (the piece w/fins)
4)Remove all tire lug nuts except 1/wheel. You cant scrap rubber, so once @ the yard they'll use a forklift to raise it off ground for tire removal.
It takes maybe an hour or two to do these preps, but a truck brings in about $300 & regular 4 dr sedan $200. Plus you get bonus $$ for the radiator/cat converter.
Easy peasy. That's why the scrappers are lowballing you. If they pay you $200 for a truck, they're lucky to sell it for $400. Thats at best $200 to haggle, pick it up, prep it, & sell it.