Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Medieval Low-Poly Carts Free.
Medieval Low-Poly Carts v0.3
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Freshly updated for Unity5!
Add variety to your medieval scenes with 20 carts and wheelbarrows that will fill up space but not drag down your performance!
Most models are under or around 300 tris and all of them use the same texture atlas (including normal map!), so that will save you a whole lot of drawcalls.
Texture is hand-painted and models are about as optimized as possible. The most complex model is little over 1k tris.
As always, ratings and feedback are of great help, the more i learn the better the content i can create.
Have fun creating!