I was at HD today picking up some lumber. Here's what I took home with ease: 8 pcs of 2"x4" 8ft length 2 pcs of 3/4" MDF: 2ft x 6ft 1 pcs of 3/4" MDF: 2ft x 4ft Sadly, the front passenger seat does not fold flat with the rear seatbacks folded forward. In order to carry lumber without damaging the car fabric, it is necessary to make supports. You can see in the photos where I've done so. Without them, the 2x4s would angle upwards towards the front, rub the seat where the headrests go, and slide around. The supports allow more horizontal placement and lumber stacks much more better. You can get fancier with support design to limit lateral sliding + bungee cords or ratchet straps. Stack 24 pcs of 2x4x8 and strap it all together!! You can carry 10ft lengths of 2x4 but it has to sit on the dash which I'm not willing to scuff up. Just think......you can't do this with pickup trucks with less than 8ft bed and keep the wood out of the rain.