The V10 prices are going to be dominated by the Ford v10. Yes there's the Dodge v10 in some 20yo trucks and Vipers but for every one of those produced a stream of V10 E-series cab and chassis rolled off the production line.
One peak is likely trucks and the other is likely vans. Trucks tend to go for more than vans because they tend to have 4wd, more appeal to people who care about image and a wider variety of job specific bodies on them. Or at least that's my (experience based) theory.
Very few cars have 10 cylinders and (speculating) the end result just happens to be bimodal. Or bad data -- some scraped value is misinterpreted as indicating 10 cylinders. Three and five cylinder engines are not common either.
One peak is likely trucks and the other is likely vans. Trucks tend to go for more than vans because they tend to have 4wd, more appeal to people who care about image and a wider variety of job specific bodies on them. Or at least that's my (experience based) theory.