THANK YOU EVERYONE for your very informative responses . . . the second time around.
I noticed in the link provided by JMOR, the durability ratings provided by jdemaris, that the Isuzu 6H diesel has a B10 rating of 410K miles while everyone else only have a B10 rating in the 200K to 250K miles.
Does anyone know if that Isuzu engine is available in a "pickup" style truck or is it only available in "commercial" type vehicles.