While the quality varies, you could also take a look at some of the plastic toy sets that are around.
I know there's some ACW sets that include baggage in their bags or buckets, and some pioneer ones as well, there's also a lot of horses (In farm and just horses sets) and, often, some oxen (or at least cattle that are relatively close and can be modified rather easily).
Scales tend to vary heavily, but there are several that are in the right size if you look.