Showing vehicle value on a balance sheet

Yes but I advise that you don't, it is unrealistic

Create two accounts, a sub fixed asset account called unrealized value and an equity account called unrealized asset value

Decide how much you want that account to be and do a journal entry

debit the unrealized value account and credit the unrealized asset value account for that amount

@jmahomes

Under US accounting standards (GAAP), under no circumstances, can you write up the value of fixed assets.  The vehicle should remain fully depreciated on your balance sheet.