I have a Quigley and did the shock mount mod. From what I could see, it doesn't impact articulation - so much as restore it. Quigley add a 2" lift block but keep the stock upper shock mount in the same place, so the shock runs nominally 2" extended. This nominally compromise rebound travel, with reduced static sag. Relocating the lower shock mount upwards by 1-1/2" restores the shock back close to its nominal static sag. It shouldn't reduce compression travel but should increase rebound travel (droop).Good eye! I haven't done the rear shock mount lift mod. Been wrestling with the compromise. It appears that the mod would reduce the amount of rear axle articulation/travel by using a 2" shorter shock and lowering bump stops by 2". Up travel reduced on one end of the axle could reduce down travel on the other end. I'm worried that would make it harder to keep my tires on the ground over uneven terrain like this, even though I would absolutely LOVE to have more clearance? You've done a ton of wheeling in your van, what do you think about the tradeoff?
We sure did have fun out there, great trail and it was a trip casually hiking over the Mexican border and back! I like to think I could have made it with a spotter and a better line, although it was getting pretty tippy 😬 Cheers!
FWIW we abuse the crap out of ours off-road as well and the shock mount relocation has stood up to it.