I would like to purchase some large fake display batteries in inflatable or cardboard form, although metal would also be fine. These 'batteries' would likely have supported a marketing booth for a consumer battery company. Ideally the size would be 4' or so long and easily mountable to a Model S roof rack. AA is probably the right size, but a huge 9V or D cell could also work. Bonus points if you are aware of a source for a large Energizer bunny that could stick out from the frunk.