I think the wheel diameter has increased markedly, like from 14" standard to more like 20" or so, and the tires have not gone to low profile.
Yeah, the 1500 is 17" to 20". The tires are 265/70 17. In 1999, they were 255/70 16. I can't go back further, but I'd guess in 1970 they were something like 195/75 14.