Will 8 foot camper fit in 6-6 bed

One thing to check: often when air bags are installed for use with a 5th wheel trailer, both bags are plumbed together rather than separately. If that's the case on your truck you might want to separate them. The problem is with the top-heavy weight of a camper, when you go around a corner the outside bag gets squeezed as the truck tries to lean out on it. Instead of resisting that, the air simply gets pushed through the line to the inside bag, making the truck lean worse.