Here are some variants of the first Lima low sided wagon numbered 2007. This "model" was rather basic with plastic wheels (big flanges). It came with and without brakeman's cab and with different loads.
2007 brown
2007 green
2007 with brakeman's cab and tank brown
2007 without brakeman's cab loaded with tank
2007 without cab loaded with tank silver
If you take a closer look you will notice two different types of military tanks (which are actually far out of scale).