Is it possible to sell 4 cars at once when playing on your own?
Obviously you can only drive one at a time, but can you leave the others and come back to them?
Really, you shouldn’t sell more than one car at a time. Vehicle Warehouse is the one thing in this multi-player game you can easily do solo, so it’s better to use the 32 Car Method. Sell one high-end car, and by the time you source it back, it’s almost time to sell again. Do this all day, and you’ll make some dough. If you already have some bank, you can just do it once per day to replenish anything spent griefing, or work it into your grinding routine.
For those not familiar w/ the 32 Car Method, it is simply this: fill your Vehicle Warehouse with thirty-two cars, no more, no less. Sell off any duplicates, so that you have thirty-two unique vehicles. Then, sell one high-end car. When you source the next car, it will be the same high-end car you just sold. Lather, rinse, repeat...