Covered Wagon

Origin
Covered wagons were the travel option of choice for American colonialists. Or rather, the luggage of the American colonialists. They were not comfortable rides.

Covered wagons were used originally as cargo vehicles over the Appalachian mountains, then as settling vehicles for the area between the Appalachian mountains and the Mississippi, until finally helping colonize the larger North American western territory. Typically pulled by oxen, these sturdy wagons carried entire families livelihoods across unfamiliar terrain, and would have to forge large rivers, stand through powerful storms, and roll through snow drifts. And though it was not terribly uncommon for them to break along the way, these wagons proved to be incredibly durable - Hollywood does not exaggerate the defense capabilities of circling these wagons, as it has been documented (such as in the Utter Massacre) to work very well.

Yet despite the harsh conditions that the colonialists had to face, one of the pervading causes of death was illness - because these wagons were unable to carry fresh fruits and vegetables on the journey Oregon Trailers would often suffer from severe vitamin C deficiency.

Usage
The entire wagon is completely indestructible to outside forces. Being completely encapsulated by the wagon (i.e. crawling inside and closing the curtains) can protect the user from arrows, fire, high-powered assault rifles, bombs...the list goes on. Unfortunately, the wagon also severely compromises the immune system of anyone who enters it, which can be quite fatal.

It should be noted that the wagon is not self-indestructible. Natural wear and tear can break it down.