At one point I bought a lot of scrap cars, I'd get them home and triage them to decide what got scrapped, what got parted out, what got fixed, and what got sold as a fixer upper.
I had things in my phone contacts like "Mexicans buy cars"
And
"Other Mexicans that buy cars"
I figured out pretty quick that nobody is allowed to work on shit in my yard after they buy it, and 9/10 of they tell you they have a trailer, and they'll be there at 9am Saturday, they don't have a trailer. Their brothers bosses neighbor has a trailer with a flat tire that he said he could use, in exchange for replacing the kitchen sink. But he's gotta do the sink first.
Now non runners are listed as "may be able to deliver" and after they see it and pay, or a substantial deposit, and verify that there's no gate, there's no stupid alley, this or that, that they live on the half of town that's accessible and I'm just going to dump it on the street or front driveway, I'll deliver "for free" if they pay asking price.
That has done me really well and minimized my wasted time.
If I'm selling higher tier shit to higher tier people from farther away its "have forklift, can assist with loading". Then it's after it's paid for, and I tell them I'm not responsible for damage to their truck or trailer, and prefer to lift the load and have them back under it, I lower it, then they drive off