Here's what the hitch on my Mini-Lite looks like. Much simpler design.
Pic 1: you can see the 4" bumper and the 3 x 1-1/2" C-channel they installed behind it.
Pic 2: you can see the receiver tube welded to the bottom of the 4" bumper and the bottom of C-channel
Pic 3: You can see where the C-channel and the 1 x 2 box beam are welded to the web of the frame rail. Just to the left of the 1 x 2 box beam is the angle iron supporting the black tank.
Pic 4: shows the receiver tube welded to the 1 x 2 box beam
Pic 5: Similar to Pic 2, receiver welded to bottom of C-channel and bumper
Pic 6: Shows back side of the C-channel welded to the frame rail. Bumper is to the left behind the C-channel
Pic 7: A shot down the length of the receiver tube showing it welded to the bumper, C-channel and 1 x 2 box beam.
PDF: Sketch of the layout.
The wires you see are for the LED running lights/turn signals I've installed on my bike rack. See Post #4 here: Bike rack