Could there be an option when adding a custom vehicle of interest to flag the customer as Trade focused? I imagine this working either as another option on the drop down (New, Used, Trade) or as a check-box for Trade on the custom vehicle.
The current use of trade-in as part of a deal is very helpful when constructing a deal but we also get a lot of trade-focused or trade-only leads and if we made it easier to separate them from truly "other" or unknown whether it's new or used leads, it would be very helpful for reporting!