Someone pointed out that a lot of US builders will drive pickups truck, and that it's kinda doesn't make sense, why don't they drive a van? Depending on the trade and location builders and contractors here will drive something like a VW Transporter, Mercedes Sprinter, Toyota HiAce or a Peugeot Partner. The Sprinter will fit e.g. your plywood, others will have mounts on the side or roof to transport material.

They won't act as a large wheelbarrow though, not well at least.

Tradespeople in the US often have both vans and trucks, depending on how they want to use them. Both are very common.

None will tow my 30' fifth wheel very far.

There's not enough room in a van. You need a F350 super duty to properly haul stuff.