This paper model is MF-813 Flying Mule, a land based vehicle based on the TV series Firefly, the papercraft created by Armor Bimbo. One such vehicle was owned by Malcolm Reynolds and was stored on Serenity.
Mules were capable of carrying up to 4 people plus cargo. Their main role was to transport cargo across medium sized distances. It could reach similar speeds to a Reaver land stalker, but its speed was dependent on the weight on the vehicle.
You can download the paper craft model here: Firefly - MF-813 Flying Mule Free Paper Model Download [mediafire]