The kei trucks aren't really a good replacement even for an S10 since so far as I can tell they won't run at highway speeds, but they're really good replacement for the Canam and Polaris money pits people buy (and are certainly way more capable of real work).
I don't own a truck anymore and now my "hack" is to remove the middle seats from my minivan and fold down the back row seats. That creates enough room that I can fit full 4'x8' sheets in it (with zero room to spare). I've hauled drywall and plywood in it with no problem. I sometimes get weird looks from folks when I roll up to the back of my minivan with a cart of plywood at the big box store.
Pretty sure the tiny bed on my grandfather's 1970 Datsun is larger than the beds on some of these behemoths.
Is it really dads? I've seen claims that is actually moms demanding this, dads just go along. (dads would be happy in a minivan, but their wife won't let their husbands be seen in one)