Larry Jaques wrote:

I've seen self-drilling screws for sheetmetal, but for framing
members?!? Is there such a thing?


Yep! Thats how the body/floor was attached to the frame of my
little camper. They were into box section so after "chewing"
up the flake board the screws were removable with visegrips
used as a miniture pipe wrench. :-)
...lew...