I agree but….. You do not see the turn until you are well within the concrete barriers. Your brain says there is no way they would design a MAJOR onramp so that trucks, RVs, and trailers will hit the barrier. You have a line of cars behind you. To un hook and back both vehicles out with a dozen cars honking is just hard to imagine. In hind site you are 100% correct. I ended up backing out anyway. Just hard to believe they would do this. In examining the barrier 100s of vehicle had hit it. Some markings were at the top of the barrier.
Hindsight is always 20/20. A learning experience and move on. In New York sometimes when congestion is severe, cars will back up one at a time back onto the freeway from an off ramp even if they were already on the off ramp. Everybody backs up so everybody can go ahead to another exit. It works. With a toad it does complicate the backing.
IR 80 was reconstructed a couple years ago between Truckee and the Nevada state line. The jersey barriers were so narrow that there were black marks from tires along miles of the narrowed lanes. I took my time and checked my mirrors constantly to keep between the barriers. It was a little nerve wracking but did not care who was behind me or how much of a hurry they were in. And I made it many times with our RV. Didn't care for it, but made it scratch free. Many did not or at least scraped their tires along the barriers.
We should never feel pressured by others to do something we feel or know is not right. Sometimes that is hard to remember. We just hope we can make it and often try; sometimes we are rewarded and sometimes not. That was not your day. It sucks but life happens.
As to so many posts deterioriating into a California bashing thing; that gets real old, too. Highway construction has nothing to do with any particular place and California enjoys most bridge vertical height clearances and tunnel clearances being more than sufficient for most RV's; not something that is always found in other states especially along the east coast where height and width can be a factor. Imagine not fitting under an overpass after missing the last exit off the road you are traveling on. Then what? Back up to the last turnoff or damage the roof and leave an AC unit behind on the road? And complain to who?? We have it good in the west for the most part for RVing.