The solution is simple: a small travel case houses a computer, HTC Vive headset, controllers and sensors. In a matter of minutes, any location can be set up to serve as our test location. Consumers are then recruited to a location, and walk through multiple shelves, wherein we can test pack designs, shelf-layout, or understand how consumers shop a category.
When looking down with the headset, the left controller might be a shopping basket, and the right a pointer. Consumers could then 'point' and 'pull the trigger' on an item they want, and move it into their basket, mimicking real life shopping.