No trucks, no minivans. I know most minivans can do that no problem and I also realize that full size trucks are great for carrying loads but that's not what I'm interested in at this point.
I know my dad's Rendezvous can do it, with the hatch open (I don't care about that). Any other cross-over, wagon, hatchback, etc. vehicles capable of holding 4x8 sheets flat, inside?
Given that a larger vehicle is more expensive to buy and to operate, you will probably save a lot of money if you get a smaller vehicle that handles most of what you need a vehicle for and then use part of the savings to pay for delivery or rent vehicles that can give you that carrying capacity. I think a lot of people end up buying vehicles that are much larger than they need for 99 percent of what they need a vehicle for. And they pay for it in terms of higher maintenance costs, higher operating costs, higher insurance costs, and so on.
For example, you can get a rental truck at Home Depot for hourly rates that are quite reasonable.