I wish smaller and light diesels motors were made here in the states,the ones we have available can only be used in heavier trucks due to the weight of the motors. I would love to have a 6 cylinder diesel that was the same size or lighter and weight of a 235 or most modern 6 cylinder gas motors available over here.
I dont know how much smaller/lighter they really are but I work for a street sweeping company and we have Izuzu trucks. They are 1-ton cabovers with an inline 4 diesel. I am not sure of the specs but they are pretty strong and reliable.