Yes, no worries as long as that car has no defects and it is in good condition.
73% of new car purchases are financed, according to this website: http://www.newcars.com/how-to-buy-a-new-car/auto-financing.html
What is the average amount financed in an auto loan
One way or another, the loan has to be paid off. If you trade the car in, you can get the payoff added to the amount financed on the new car.
It varies according to the dealer.
No, you can trade a used car for another used car
Since the car is financed, it already is collateral for a loan. Your car loan uses the car as collateral for that loan. I think the only way for you to use the car as collateral for a different loan is to have the NEW lender pay off your car loan, tack the ammount of the car loan on to the new loan you are getting, therefore they would then be the leinholder on the car.
Depends on what arrangement you are able to make with the dealer.
Sure, but you will not get near what the new car is worth.