I think any H1 or H2 owner should prerun it in an H3 as a passenger and decide if they want to do it. Body damage is a big possbility as its tight in there at times. Its a fun trail and tougher then LCC but nothing ridiculous. We did nightmare gulch and LCC in one day and is doable in a smaller group, a bigger group could do it but you need to keep moving and minimize stopping for pics. We did nightmare from the campground to LCC which is tougher IMO, If you did LCC then nightmare to the campground it seems easier and some of the obstacles are downhill.
We stopped to spot and take pics 6-8 times, you could do less but took it easy and explored the trail. There are also 2 optional obstacles that are fun but we didnt try them today.
Expendable, I believe so but its very off camber.
With that said here are some pics!
Dutch cleanser mine
good shot of spring over height vs stock