[Gildo]

The mount inside the chassis "rail" is similar to the Warn rear bar.
To mount the warn bar you enlarge the hole and a bracket bolta to the bottom and the side.
With those mounts it should be plenty strong.
Tricky working out the best possition for the pivot too, cant obscure the lights and cant block the tailgate. Good suggestion the LEDs in the bar.
The welds look great!
What catch have you sourced?