For me, I just sell my I/E cars without ghost org or off the radar in a full, fully assisted aim lobby and never had any problems getting that done. Why? because every else is playing tryhard by stroking their precious pointless K/D and wasting money while i'm probably the only one making cash.
I actually think this is better than doing it in a solo lobby where you have to deal with those AI blue sultans who have perfect shooting accuracy.
I have to say--in most cases (though not all), using the Cargobob gets around the Blue Sultan AI BS quite nicely. Kudos to flexcreator for his helpful vids!
And I have to laugh at how I get a notification still telling me to "Boost off the ramp and through the ring to perform the stunt correctly and avoid raising any suspicion." (screenshot below) while I'm long gone already with the car in tow... just drop in, collect car, and off you go!
Using the bob also helps get around other players nicely too. I only ever source and sell with a bob (however lag issues can cause the car to drop off). If nothing else, bobbing the car saves a lot of time.
FYI you can also cargobob the trailer for the phantom wedge gun running sale mission (however I'd advise against it since the phantom wedge is the easier option).