i don't worry about it and i was rearended in my 86 monte carlo ss by a 90's chevy pickup at maybe 30 or so because the kid droped his cell phone/ and my monte took it like a champ the worst damage was my bucket seat frame was broke at one bolt in the front the newer truck well it needed some parts for it
i didn't have to replace anything but the shocks things for the bumper, score one for one of the last full frame cars
the only thing i might upgrade to is the 3 point seat belt but the only reason i really wear one sometimes is because it's the law. I don't drive my old truck for the safety of it.