Yes you should make your 6 year old son wear diapers on a road trip.
Diapers are a great thing for road trips for older kids or anyone of any age.
At 6 years old the kid cannot hold their pee that long and a 6 year old is more likely to wet their pants when on the road trip.
Toilets on road trips can be far away when the kid needs to pee.
So if the child is wearing a diaper while on the road trip the child can just pee the diaper.
I was made to wear diapers when I was 6 years old on road trips after I wet my pants.
I was so glad to be wearing a diaper after that and started to really enjoy the diapers.
I now as an adult wear diapers on all road trips and I just pee in the diapers.
No need to find a toilet because diaper are my toilet.