This has been a topic in the past and you'll find varying answers and reasons...I do, but only in a situation like you mention.

You may want to send your CPA the info on yjr specific truck and see based on weight limits which category it falls under 

The values vary widely in sometimes just a few blocks.

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On an actual owner financed sale, generally varies from 4-10%.

Keeping in mind this can vary widely: I would say seller financed interest rates would generally be above standard bank rates yet lower than hard money.That is the question asked.

Here is what I was taught a good comp should be:- 6 months of sales-  +/-200 sqft of subject property (1,000 - 1,400 in this case)- 0.5 miles from the subject property- same ba/br or close to it and adjust- do not cross major boundaries such as a different city, freeway, major road, etc. because local markets vary significantlyI'm not happy with this person using 12 months of sales data, but okay I get it.  

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