It has this latch thing on the top of the cab:

anyone know what that was for? This next pic might help with that it has numbers on the side much like a military or fleet truck would have says U6000:

Now one more, what is this thing? One hose goes to the base of the carb. mount:

And for good measure here is a quick pic of the '72 enjoying a week in the garage:

About 12 more pics of the '48 here:
http://s113.photobucket.com/albums/n203/Galaxie64/
It just needs a tank to be running again and a brake job to be road worthy. I am thinking of getting the gas tank in and brakes done and slipping a bench seat I have in the cab and running it around for a while until I have more room to work it over. It also needs all new glass, the back window I can live with for now but everything else needs to be new.