Thinking about getting a Chinook but haven't seen one in person so I have a couple questions. What is the bed length? Can it sleep two adults? I am 6 foot, am I too tall? Is there room above the cab for people to sleep or is this for storage only? What is the average cruising speed on the highway for Chinook, 55 - 60? Really want one but not too many in Nebraska to go check out. Thanks!