GON, I don't believe that to be true. I think daily driving an emissions diesel for short trips is worse than letting them sit. The key to modern diesels is getting them up to temperature so the emissions system can work appropriately. If
@wwillson is using the truck "hard" when he uses it then I think it will solve any issues from it sitting around.
Of course moisture (condensation) in fuel could be a concern with sitting, but the fuel filter should take care of that pretty quickly.
Just my $0.02