The other issue here is manufactures today leave less wiggle room in their engineering. The safety factors are less than the past.
Also in some cases one or all axles are overloaded.
I cringe when I here on the forum 65 MPH is not fast enough to get where I am going......Really???? that is insane, not a popular point here I am sure but anyone doing that is putting their families at risk....... ( I know many think that is not true but it is) Try to do a panic stop even at 65 with a 15,000 to 30,000 truck trailer combo. Even the professional truck drivers have trouble with that one. When I see a large fifth wheel whiz by me I just can not believe it. Very few of us here are professional drivers and it shows on the road. Not RV related but a guy locally last week did not take enough care at a RR crossing he lost a 3 year old daughter himself & two other children are in the hospital still a couple weeks later............ I am just saying take caution the world does not revolve around us and the danger can be greater than we can imagine. There is a very good reason School Buses & other Rigs Stop at all RR crossings............
As far as the past there was no social media, or internet, & tire blow outs, accidents were rarely reported....... We only had 3 channels on TV as well............. so who knows