Woodpecker think of the cars in the 60's, especially the big variety, they
were tanks!
I would also assume that the vans of the day were similarly constructed, combined with relatively low performance there would be little in the way of stopping them. We today unfortunately have a tendency to 'get there quickly' which has its toll on both car and van.
I remember reading about people who crossed continents in little Ford model T's with two wheel drive, skinny wheels etc. Yes they did it but took months to cover what today we tend to take a couple of days to do, and they did it bloody hard.
I have used the very basics, shanks pony, and covered relatively long distances, but I'm an old fart now and like my comforts so we carry more and do it in style.
Ian G.