GW's heroic scale is probably close to 1/50 - 1/56th so you might get away with 1/48. You won't really know until you see the stowage next to your model.
Scale reference on Wikipedia:
http://en.wikipedia.org/wiki/List_of_scale_model_sizes
Sandbags, some crates, tow chains, and baggage tends to be more forgiving than tools, wheels, and ammo.