Once you find this wall, you jump in the air, levitate to maintain position, and throw a portable truck against the wall. To perform the trick, you have to have a wall nearby that is angled opposite where you want to go. Angled or rough surfaces are more difficult to pull the skip off and moving fast while doing the skip is incredibly hard. Depending on the surface, a PTB can be difficult to pull off. The goal of this trick is to launch yourself across the map vertically and horizontally. This trick normally is used near the end of levels to prevent you from dying. Otherwise you won't stick to the portable truck and you will just fall to the ground and die. Besides having the correct angle of throwing the truck, which is slightly forward straight down on the ground, you have to be holding jump. Not to be mistaken by the famous Portable Truck Boost (PTB), this trick is to use the portable truck against the ground to not fall on the ground and die (like normal), but you do this right as you are about to hit the ground. You can also use this to move fast (since you can pair it with moving forward too), but it is not recommended to do so because of how inconsistent it is to always land on the sides of trucks. This should result in you lifting upwards like a magical goddess. To really get the effect of jumping on the side of trucks, you must hold space on the side of a truck. However, normally tapping jump is not used on the side of trucks.

It is possible to jump on the side of trucks. If you do this, and jump as low as possible off the truck, building up speed should be easier because you spend less time in the air and more time pushing off trucks. To perform this movement, you want to abuse the fact that when you go off a truck you have a short period of time to still jump despite not being on the truck. Therefore, most of the time it is better to hold the WA/WD keys (while tilting the camera at an angle to remain moving forward) at all times to move diagonally.

It is faster to move diagonally than it is to move straight forward.

Clustertruck speedrun