@bbforks
It was finished in september 2009.
It was based upon prices and costs of 2008 and 2009.
The trucks considered were 1,5 to 5 tonners.
The ranges and specifications based upon actual market feedback. The symptoms of 2008 crisis were clearly visible.

I think it's at least partly (aftersales costs, residual value), still valid. Although the sensitivity of the project (financing costs risk, customers stability etc.) may be slightly different.
I think it's similarily actual concerning manufacturer attitude considered as one of Porter forces.

Once more I repeat - this was based upon polish market conditions in 2008-2009 and applied to IC (LPG) trucks