2004 Lance 835 TC

My friend isn't exactly camper savvy. This unit he's looking at was designed for an eight foot bed. His truck is a short bed. I told him about the differences and he doesn't care about the looks. He thinks the absence of box extensions behind the short bed would help aerodynamics. Thoughts on that the pros/cons of using that camper on his truck? I mean, what esle can I tell him about that sort of thing than just looks and loss of storage locations?