A few tidbits from the CruiseMoab Golden Spike runs; I've been mostly helping out as tailgunner, but was once also asked to lead when the trail leader suffered a break.
Tech stuff: CM has a mandatory tech inspection. To get on a Golden Spike run, you'll need two lockers, or locker rear and that ATRAC computer thingie in the front.
Group size is typically 16-20 vehicles.
The run last April was 23 trucks; I was in the back. Didn't stop at any obstacle until we got to the crack, around 2pm. Everyone just kept moving. Not very fast, but rather steady. Minimal to no spotting. I spent lunch time at the Crack removing one front shock where the seal had let go, and was the last one to cross the crack at 2:39pm. We were on the highway ~5:30pm.
The CruiseMoab run had breakdowns in the past. Two years ago, the trail leader broke a steering box sector shaft on Golden Stairs. The truck was moved to a safe location, they made a 2m radio call to camp for parts; two other trucks stayed with the disabled vehicle, and I was asked to take over the lead to get the majority of the group out. There was another break, a rear differential at the bypass to Body Snatcher (yes, there is a ledge; methinks the break was due to the driver being tired...). We split off another small group that chaperoned the handicapped vehicle, and lent a strap where needed, whereas I continued with the main group. On the exit road, we met two trucks coming in, carrying the spare sector shaft. I cut a tire somewhere coming down Gold Bar or on the exit road and had to change tires about half a mile from the highway. All in all, we were out at ~7:30pm, including the truck with the broken rear axle; the guy with the broken sector shaft was in camp at 1am.
Last year I was passenger in Claudia's FJ40 when she broke a front axleshaft; it let go at the Golden Crack. Again, the main group continued, and a small group stayed to repair the vehicle - we had a spare short-side assembly in the truck; removed the broken part, installed the replacement, and continued onwards. We were some 50 minutes behind the main group, out at ~6:30pm.
So: the group splits in case of breaking something, and the main group continues; the objective is always to get the majority of participants off the trail, while still making sure that the broken party isn't left alone.
Spotting: the trail leader spots only a few vehicles in the front, and only when needed, but typically continues to motor on. In my gang, we've sort of become self-sufficient in terms of spotting, and spot ourselves when needed, sometimes just via the CB radio. But everyone knows that they can always ask for a spot in case where they're not sure - and everyone does, including me, and even my wife

. It's a lot easier to spot a truck through an obstacle, than to recover/repair a broken vehicle.
Main job of the trail leader is to move, not to babysit everyone. CruiseMoab typically tries to distribute a few trucks with experienced drivers across the group so that help/advice/spotting is close by. It's encouraged that those new to the trail drive behind a similarly set up vehicle, so line choice is easier.
To me, it's important that those clearing an obstacle first move forward to the extent that
all trucks in the group can pass the obstacle and still fit - I think that's important early in the trail (Waterfall, Wedgie, LaunchPad, and Zuki Hill) when a lot of time can be wasted.
As for taking it easy: here are the things I usually don't bother with (for various reasons): (1) the inside line on the switchbacks, (2) that optional ledge left of the trail, near the cliff once you're up from the switchbacks, (3) the hard line (left) on the Waterfall, (4) the 'Wall' left side of the trail just before the Wedgie, (5) the ledge on Zuki Hill, (6) Double Whammy, and (7) Body Snatcher - got the dent already. And I think the line has changed at what we used to called '2 Ledges', coming down from the rim midway in the trail: nobody drives that ugly drop right next to the tree anymore, but takes the bypass a little further down the hill. And as of now, I have no intention of trying the W.E.D. route that branches off after Skyline Drive and rejoins after Zuki Hill. So, maybe not hard enough for some, but works out to plenty of fun for
my truck and
me.
And for what it's worth: Golden Spike is a trail that's not hard, but that will bite you the moment you let your attention slip. So I try to remind myself periodically to remain focused; my shtick for this is to try and drive everything as smooth as possible, not slip a tire, and not hit any rocks. Doesn't always work, but that's what bumpers are for. I also know myself well enough to know that I get tired when I become dehydrated, so I make a point of keeping my fluid intake up - no alcohol, goes without saying. Same for blood sugar, especially when it gets into the afternoon. I found an energy drink useful in the afternoon. But I'm getting old.
Anyways, maybe this is useful.