No bead locks??

Note extreme wheel articulation.

Visualize RF outside and LF inside tire bead stress through his climb.

RF sidewall, bead lock and rim stress.

Note the RF vertical wall.  Did he spin his tires?

Same wall.  Traction was perfect to the point of leaving virtually no tracks.

Next 8 pictures, sidewall stress.

6 to 8 PSI.

~ 1.5 to 2.0 PSI.  Tire bead same at both pressures.

Note inner sidewall bulge.

Note LF tire sidewall stress.

Maneuver, articulate, stick and move.  Note RR.

LF bead stress.

LR bead stress.

Know this one?  Cody stuck it.  Cody, "Wow!"

Bead lock may be preventing complete rim to rock rubber pinch.

No tracks mean perfect traction.

Sharp rock corner stresses everything.

Inside sidewall equally stressed. 

Cody Waggoner and Harry Lewellyn