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Originally Posted by AdrianD
the miniature engines, like the most recent 3-cylinder turbos, are optimised to meet emissions in very tight operating conditions
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It seems like the higher load factors are more detrimental to their initially-perceived advantage than the operating conditions (weather, traffic flow, among others).
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Mercedes met Euro 4 standards with the OM642 diesel without the need of a DPF.
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DPF sometimes becomes a PITA, and it's even more problematic due to its interferences when some alternate fuels such as B-100 biodiesel or pure vegetable oils are in use. Running leaner on the main fuel and supplementing it with water and alcohol injection (eventually resorting to the residual water from the air-conditioner) would make more sense, and eventually also turn the SCR system redundant.
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Anyway, regarding engine size vs tow rating:
The same Sprinter sold in Europe and North America has the same tow rating. However, they did not sell the 2.2 liter versions in North America. 2.2 versions die an early death when subjected to the abuse of towing heavy loads. 2.7's on the other hand still truck along.
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Look at this Brazilian truck, fitted with a 2.7L straight-5 for a 7-ton GVWR (that's the Euro-3 version):
Even though it was successful in the market, its Euro-5 replacement was fitted with a low-revving 4.8L straight-4.
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We all know that most van drivers are not mechanically empathic at all 
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My dad always says, people tend to drive worse whenever they're driving a work vehicle they don't actually own. It's the boss who's going to pay for a clutch replacement anyway
