This was my lesson
No Lockers -spins alternating tires about 55 seconds in
Lockers - all four tires rotate at the same speed regardless of which one has traction
Same spotter, but the Rubi driver is a newbie and lockers took him (me) right over without slipping once.
2011 Nat Green Rubicon Unlimited, RR XHD Front & Rear, Warn M8000, Rock Hard 4x4 Rails, Flipped Mirror, Cobra 75 CB, MyGIG & Infinity, NAV, Homemade Bikini Top, 35x12.5x17 Toyo MTs on ATX Crawls w/ 0" offset (4.5" B.S.) with trimmed fenders, small lift needed soon.