Bed Length Questions
Here is the info on the bed length
The Pickup Box
The F-150 SuperCrew is, first and foremost, a pickup. SuperCrew's foundation is the chassis of the acclaimed 139-inch wheelbase _SuperCab. The pickup box measures 51/2 feet long and is the same width at the wheel houses as the rest of the F-150 lineup. Because there is no other full-size truck like the F-150 SuperCrew, extensive customer research was conducted to gauge reaction to such a configuration. The response from work and personal use customers was overwhelming. Customers said they truly appreciated the extra interior space, not only for people, but for clean, dry and secure storage for things such as tools and groceries.
"Offering a more user friendly, comfortable interior while maintaining pickup versatility is a swift answer to a new customer demand," says Al Giombetti, Ford Truck group brand manager. "We've seen the steady growth in the pickup truck market for several years, led, in part, by the personal use area." For those times when the pickup box is called upon for hard work, SuperCrew meets the needs of most customers with 44.2 cubic feet of cargo capacity. Standard payload of 1,765 pounds is the same as F-150 SuperCab.
Larger items, such as 4x8 sheets of plywood, fit between the wheel houses and can be carried with the tailgate lowered. An optional Bed Extender allows more flexibility when transporting large items such as lumber, cinder blocks or firewood. The tubular steel bed extender is a curved cage unit which attaches to the rear of the pickup bed. With the tailgate lowered, the unit pivots from its stowed position within the box and locks into place extending the load-floor to seven feet. With the tailgate closed the stowed bed extender provides a convenient storage area, keeping smaller items from sliding around the bed while the truck is in motion. The Bed Extender can also be removed, allowing full, unobstructed use of the 51/2-foot box
Your other questions would depend on the size of the shell or cover you choose and the size of your bike. I think most of the pickups I've seen used to haul around bikes go with out a cover or shell.
Maybe with the front tire off of the bike it would fit in a roof level shell.