I can't build a truck for my transport. What is level 2 max 3 floor etc?

For truck you need to build floor level 3. Click on the house on the right hand corner, you will see 4 options. If you build a wooden floor and then press X in red, you will be able to select the wooden floor which is already built. It will show you 2 options, dustbin mean delete and up arrow means upgrade to level 2 and 3. Beside the up arrow in gree you will be able to see what you need to build level 2 and 3 floor. For 1 block floor you will need 5 stones and 5 pine plank using carpentry table. Same for level 3 ull need 15 brick made using stone with the help or stone cutter and 10 iron bars made using iron ore in the furnace.