@Scurv: I'm pretty well limited to shopping online, there is very little in the way of local stores that would be useful for these efforts. I live in a city of 7,000 on an island in Canada's (sub)arctic, access is exclusively by air, and the nearest gaming store is ~2,000 km away. Do you know a source for these 28mm-compatible trucks?
@rwwin, starkadder: Duly noted about the German kit, it does look close to what I'm looking for, but it is disappointing to hear that is both fiddly to put together and not all that durable.
The GW kits would be a last resort, I really don't like them.