I got this set second-hand from a friend without the weaponry and the chest. I've never used it as a supply wagon and never built it according to original instructions because I had none.
Like other similar sets(6016, 6022) I've turned it into a war-chariot but with parts from other sets. Although the plough design given here seems fine, I don't think that there are many possibilities for alternate models. The set is fine, it features some nice parts, but that's all it's good for - parts!
P.S. And may be a wagon derby - if you preffer!