A towed trailer with customization parts in it to work as a mobile upgrade station & body shop. One large enough to maybe fit a small scout inside to work a moving outpost or garage away from home base. For balance and immersion it could l have options for everything except the larger frame add-ons or needs to be brought to a trailer store to access those. Even a small scout race trailer that has basic upgrades like tires and snorkels with all visual options would be great.