Then this is what I would do:
Only enter the full amount of the allowable property tax on ONE of the business vehicle entries. On the second vehicle, add the full amount of allowable property tax as vehicle loan interest (the program will prorate it, just like it does the property tax). Or you could manually calculate the prorated amount as put it in the parking/tolls spot.
That is only a worksheet in the program, so entering it as loan interest should end up on the same spot on the actual tax return for your rental as would the property tax. But it won't incorrectly double an amount anywhere.
