Last Oct. I emailed PullRite about fitting their heavier rated SuperGlide hitches in the Rams with GN/5er pkg. and was told the 18k ISR was the heaviest rated that would work with the picture frame adapter. I then asked about fitting a plate with 'pucks' and bolting/welding a 3600(24k) to it. The response was 'we don't have any thing (parts) that would help. But, you're welcome to try'.
Well, I went to their site yesterday based on some chatter on another site. They have come out with their own 'picture frame adapter' and a new ISR 24k hitch. Their version of the adapter actually breaks down into 4 major pieces, which definitely makes it easier to maneuver in and out of the bed.
Just thought I'd put this up for folks.
MikeM
2014 Ram 3500 Limited Mega Dually 4WD (True Blue Pearl) w/Alcoa's & paint match bumpers.