I had Dodge bed on my older F350 and it had a million cracks on it.
90% of original spot welding had cracked around, while tailgate corners simply split. Had some welding jobs on it every year.
Don't think I would like to attach TC to it.
New truck has aluminium bed, where brackets holding on couple of bolts might not be strong enough.
Than you have mechanics behind all of this and I am not going to argue with engineers who figured out frame-mounted ties.
Extending the plate for getting fastgun out of fuel door is not much option on new trucks neither. Due to dual fill ups, the door is about 8" long, so you'd have to extend the plate a foot or more, what would keep the back door from opening.