A little camping trailer, roughly 2 meters by 1.2 to 1.5 meters, internal 2 meters or greater in height in height pop up would be the best option for that, the walls roughly 1m tall or taller than 900mm from the ground for electrical plug and water storage, to be in line with relevant laws, and aerodynamics during travel. An optional storage or living space, Attachable Annex or Sun shade would suit. Cooking facilities on outside of with secure compartments and locking facilities for the bike to the camper. I suggest internal Locking wheel hubs to eliminate external gain via bolt cutters etc, would probably suit best so the camper is immobilised, and the. Lockable fold down cooking facility for safe and easy storage. You could probably even extend to add an external fold down bed on the other side so is that it could be a 2-in-1 camper or your storage on the inside sleep on the outside. I believe we could achieve hi turnover so I could not give an estimate on the overall total figure required