I just welded a piece of square tubing to each frame rail. Each one was about 16" long and skip welded parallel to each other. They had a hitch pin hole drilled through the center. I use different attachments that I bolt on with a shoulder bolt through the hitch pin holes. One has a 2" ball to pull my alum fishing boat, another has a 18" wide expanded metal tray for the generator or firewood. I'll soon be building a wider tray, which will require adding lights, so I can haul the tadpole trike that I'm building. Just have to heal from a 2nd carpel tunnel surgery this coming Monday.
2012 Chevy 3500HD Dually 4X4
Crew Cab long bed 6.0 gasser 4.10
2019 Open Range OF337RLS
Yamaha EF3000iSE
retired gadgetman