If the truck bed is kept warm, it will clean itself. Tarping the truck will also keep the mix hot during transport, and is strongly recommended. Some agencies suggest silicone. The mixture flows better under the paver screed. Silicone, however, can affect the binder testing of the modified asphalt, giving false results.
Silicone can also irreversibly damage test equipment.
If silicone is used, testing samples should be taken before the silicone is added. Uniform, continuous paver operation produces the highest quality pavement. It's always a good idea to coordinate plant production and paving operations so there is a continuous flow of mix supplied to the paver. This is particularly true with Stylink modified hot mix. Continuous delivery to the laydown operation prevents the mix from prematurely cooling.