Bouncing Box
Can't wait to see how the new ones jump around then, as the frame is suppoed to be even stiffer.
I'm glad to see this topic - I thought I had a problem. My truck does the same thing - the back corners of the bed bounce when I'm going fairly slow (~20-30mph) and the road isn't perfectly smooth. I have an '06 SuperCrew w/ 6.5" bed - thought it was maybe worse since I had the longer wheelbase - but sounds like you 5.5 guys have it too.
My 2000 S/cab with 6.5 never caused me a second look. But man, this 2008 S/crew with the 5.5 was sure a surprise the first time I noticed it on some uneven pavement around town. And the drivers side does seem to bounce more than the passenger side, for whatever reason. The middle of the box doesn't move but it looks like the sides and corners are teetering on the centre line of the box. Very different, but apparently normal from the sounds of it. Oh well, at least it's an F150!

Mine moves around, but it hardly looks like something is unbolted.
My 2000 S/cab with 6.5 never caused me a second look. But man, this 2008 S/crew with the 5.5 was sure a surprise the first time I noticed it on some uneven pavement around town. And the drivers side does seem to bounce more than the passenger side, for whatever reason. The middle of the box doesn't move but it looks like the sides and corners are teetering on the centre line of the box. Very different, but apparently normal from the sounds of it. Oh well, at least it's an F150!
Maybe some FYI: IF you have the Conticrap tires, dump them for some good tires. And/or might help to have them check the rims to make sure one or more isn't warped, etc. (had two on mine that way). Also check the emergency break s/u b/c they are known to stick. Way I fix mine is press the brake down slightly then put in reverse and back up. This will free up the brake if it's stuck(usually). My 05' use to jump around all over the place until I fixed these 3 things. I believe just getting a good set of tires makes a world of difference.
guys from tundrasolutions right now are probably baiting off this thread and posting like crazy "F150 HAS BED BOUNCE PROBLEM!" " FORD ISSUING BED BOUNCE RECALL" " TUNDRA HAS LESS BED BOUNCE THAN FORD"
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