How do I enter into Quickbooks a new 100% business vehicle loan with balance of previous non 100% business use vehicle?

How do I enter into Quickbooks a new 100% business vehicle loan with balance owed pm trade in previous  personal/ business use vehicle?

I purchased a new vehicle which will be 100% business use only. We owed more on the trade in vehicle than what it was worth. The previous vehicle was used for personal and business. 

For easy math.

New Vehicle:$50,000

Trade in Vehicle Owed:$4,000

Please advise: Account Set Up and Entries.

Thank you in advance.