I was cruising ebay looking for HO locomotive parts when I tripped across something completely different so looked up the manufacturer. This company supplies model kits including a couple of 50's vintage 1/48 trucks that look like they might be decent kits. The price looks pretty reasonable, too. They're not in my scale, but I thought I'd pass them along here. This is one of those things that I find tempting about O scale. 1955 Chevrolet 2 ton Stake Truck 1/48 Plastic Model Kit (atlantis-models.com) White Fruehauf Gas Truck Sinclair US Army NEW GLASS Plastic Model kit 1/48 (atlantis-models.com)
Those kits look really nice. If I was an O person, I would give them a try! They sure stir up some memories for me!