The dent doctor that worked out a small dent on the front fender said it was the thickest steel he had worked with except for 50s and older, said it was very difficult to remove dents.
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You know the dent guys are trying to make it look more difficult than it is..

I handeled SSR fenders and - the opposite is true.
They are very thin.
each weighs 14 lbs. the reason for thin metal is the extreme shape to be stamped. When I make fireglas fenders they weigh 13 lbs.
The weight punishment comes from the fact that it is a truck and it is a convertible. It was said the roof mechanics alon weigh 700 lbs.
To keep it ithight when roof is down they put quite a bit or feinfocement into the body also.
Frame is boxed.But it was not a didcated frame, they literally took Trailblzr frames and cut them.Then each was rewelded together and heavy patches were used to overlap and weld. By looking at them I guiess there is another 20 exrta lbs just because they did not want to tool up for a new frame. They did try to shave some weight here and there - the hood is very light. But surprisingly, tonneau cover is too heavy for it's duty.
Another weight adds because they build it with towing in mind.
The rear crossmember is a heavy piece of work. The hitch alone must weigh 15 lbs. Solid rear axle not a light part either, and the 20" and 19" rims/tires are hefty too.
6 brackets for running boards weigh 25 lbs. But wait, good news! There are people who keep working on making these truck heavier yet. Ever handeled Simple engeneering skid plate? While we admire the efforts to stiffen the front, adding 100 lbs flat piece of metal is hardly what one would call the most effective solution..
As far as comparing to a Corvette, - well - oranges and apples