What’s Carmax, Vroom, Shift, Carvana offer for? A lot of dealers will match these offers.
That being said, Sure. A dealer will pay off your trade to get you into a new car but in general don’t expect it to be pretty. I recently rolled in $5,500 of negative equity into a deal and only due to my shrewd negotiation as well as a boatload of incentives did I do well.