<<Probably not too many, but I take some not so leisurely drives down
I-95 where I wouldn't want to blow out a tire! >>

And I'm sure most all folks would agree with you, me included.

But on the other hand, I for one found no benifit from running rock hard
truck tires on my Van while cruzin' down the highways and by ways, other
than making the suspension BANG while running over every expansion joint
and pot hole in the road.

I think the 8 ply ride is overkill ( except for  4wd ) and not condusive
to the Vans suspension longevity, and my happiness.

For highway use a good 4 or 6 ply, high end, water siped, tire is more
than you'll ever need.