Sorry for the delay getting back to you, but there were one or two things to sort out when we got back from hioliday.
Having looked more closely at what I have, the two trucks are Lake George and Boulder ones in yellow, a stake car and the other a gondola (here's a photo of one in case the terminology is wrong). However, I bought both only recently second hand and looking closely at the latter I've just noticed that it's already been subject to a bit of attempted kit-bashing as the chassis has at some time been unscrewed, cut in two and then put back on with an attempt to glue it together! Maybe the offer from Hobo is the one to go for if it will meet your needs.