Im in the very early stages of planning a trip to WDW. We are considering renting an ECV from an outside company for my 66 year-old father who has knee problems. He will need the heavy-duty sized ECV. We will most likely be renting a minivan. Our party consists of myself, my husband, my mom and dad and my 7 year-old niece (four adults and one child). Do you think there will be enough room in the minivan for all of us and the heavy duty sized ECV when it is disassembled? I know the rental companies do not allow you to remove seats from the minivan. Also, do the heavy-duty sized ECVs have any trouble fitting on the WDW bus lifts? We will probably use the WDW busses sometimes and the minivan other times.