The 2015 Ford Transit van is pretty hard to roll over (I know, I tried) but if you really get enthusiastic about wrecking one you'll crash in the comfort of a 15 foot airbag.
The 120-liter side curtain airbags on the new Transit van are the biggest Ford's ever put into a vehicle, and definitely the biggest I've ever heard of in any vehicle.
The 15' x 3' inflatable is a single-bag, tethered to the van's B, C, and D pillars. A Livonia, Michigan based automotive supplier called TRW developed it in conjunction with Ford. TRW also makes more normal-size automotive safety components, steering parts, brakes, and other bits.