how do I trade in my negative equity truck

If you can find a lender via a dealer that is willing to do that but remember that the negative equity from your old truck will be added to the contract to the newer vehicle making you further upside down than you are now. Best thing to do is to just keep at it until you get more of it paid down, then hopefully interest rates will have dropped, and you can get a better deal.

I agree with Gene. Plus you'll be paying for two vehicles, one of which you no longer have. So, unless your current vehicle is falling apart or you're in absolute financial straits, keep it. If for no other reason, than to wait for interest rates to come down. You should also know that it doesn't matter if you're upside down or not. The money you owe on your trade in is added to the price of the new vehicle! I've only done this once in my life because the vehicle was falling apart. I owed $1,200 on it but the vehicle I was trading in was worth $2,500. So, they deducted the $2,500 then added the $1,200 to the price of the new vehicle I was buying. The numbers are small because this took place many years ago but the concept is still the same. Jim