My aluminium bed is not longer.
I measured it at 8' and 2 inches, so both of my campers go all the way in.
What I learn by experience, it is good idea to add a 3" stripe of 3/4" plywood at the very end where tailgate usually go.
The bed ribs end 3" before bed end and don't give good support for end of the camper. One of them dent before I made the stripe.
You have 2 bolt heads sticking up on very end, so you have to carve the plywood to go over them, but then bolts and camper weight hold the plywood in place and having good frame under that part, make very good support.
Factory mat was pretty cheap and looks good, but darn heavy when you have to remove it.
