Oh, on grinding off the GMT900's receiver bracket...I do NOT recommend that. As
it is part of the crumple zone and the liability is high if you modify it
I'd make a bracket to add any one of the after market receivers of traditional
design
That bracket would be on the outside of the frame rail to interface with the
new after market. 'Stuff' in the way would be the issue.
DO NOT drill on any frame rail flange. Even drilling on the web risky with
today's hydro-formed and tempering they do to gain the strength with the reduced
thickness metal