You may want to check out Pub 463 for the rules around deducting  business vehicles, this should drop you close to where you need to be in he Pub 

https://www.irs.gov/publications/p463#en_US_2022_publink100033959.

What kind of business is your client in? Are you sure this is being used 100% business? 

F250's certainly meet the GVW test...