I don't know how you are traveling...but we took an air mattress for our son (who was 14 and adult-sized)...He loved it!!!
You have to do a little manuevering in the room for the night, and during the day, we would stand it up against the wall.
He said it was so comfortable! Both he and our daughter were calling dibs as to who would sleep on it for the night...It cost $40 at
Walmart.
Might be a good solution for you...