What is the $amount of an additional adult in a room? I am going with my parents (2) and my children (2), total 5 in the room. I would be the additional adult. I'm sure that the rate varies from value to mod to delux. But, what should I expect reasonablely to be the additional cost increase to be for each level? Do we have to pay the extra amount at POR-AB since they have the trundle bed?