Reporting the sale of a vehicle used in rental property business

I began my rental property business in 2010.  At the time, I had a minivan I began using for this business (minimal miles).  In 2012, I traded the minivan for a station wagon.  Trade in value for the minivan was $1,500.  Total Depreciation Equivalent for the minivan = $243 based on mileage.  Purchase price of the station wagon was $18,750 + $1,266 tax = $20,016 total.  In 2024, I traded the station wagon for an SUV.  Trade in value for the station wagon was $600.  Purchase price of the SUV was $44,800 with taxes.  Using the mileage I reported from 2012 through 2024, the Total Depreciation Equivalent for the station wagon = $649.  Since I traded in a vehicle when buying the station wagon and then traded the station wagon for an SUV, how do I calculate the station wagon's Vehicle Cost and Basis for Gain/Loss?