This semi truck with turnable wheels (operated using rudder controls) is quite big, has a lot of fuel, a lot of power, and a lot of space in the back. To operate, first pull the VTOL meter all the way up (so the nozzles are pointed straight back), give it about 15% power, wait a bit until it's reached around 10mph, and then press the detacher 1 button to release the trailer, which should fall into the appropriate spot. After this, throttle down to about 5-10% power (top speed of around 70mph at this level) for best fuel consumption and turn sensitivity, and you're on your way! Please note that it is a bit fidgety, and turning the wheels too hastily will result in the truck attempting to achieve a barrel roll. This attempt will not be successful. Otherwise, have fun with it! Paint it interesting colors! Carry different cargoes! Blow it up! Drop it from 30,000ft! Do whatever!

Edit: This thing can fly. I'm at a loss for words. It's not just a brief jaunt up the y axis, either; no, it can stay airborne for a minute or two (about 5-10 times as long as the first plane). It's going to take a few attempts in order to get a perfect flight, but oh my god is it worth it! To make it fly, follow all the aforementioned instructions, but throttle it up to 100% after the trailer has been released and is in the hole, and then move the VTOL meter down such that you can see it gradually begin to lift off of the ground. Get it off the ground and adjust the meter to maintain a steady(ish) course. Boom. Flying semi. You're welcome.