Who's Towing a 5th with a half ton?

Im not the weight police, but I've had a 2011 Silverado 1500 with tow package. Owners manual specifically says NOT capable/acceptable or whatever for 5th wheel. Yet, there's at least two people who posted that clearly have virtually the same vehicle, who, I guess, feel they know better than the manufacturer. That's fine.. their choice.

Or maybe they contacted chevy truck folks as I did and found out the reason GM didn't recommend the wifes 1500 4x4 crew cab chevy/GMC 5' 10" bed for towing GN/5th wheel trailers was because they felt the bed was too short for those type of trailers. Engineering said it had nothing to do with the trucks load carrying capability.
Her '16 truck now has a GN plate in the bed and safely tows my GN trailers to and from muddy worksites.