How do i apply a large vinyl decal to a trailer?

spray some water on to the side where u want to have it pasted which should stay there for some time, peel off the backing, lay it from one side of the decal,confirm that the position is right, and then with a rubber squzee, take off the water bubbles from the surface.Finally rub with a towel to let the adhesive stick firmly to the surface.The water acts as a barrier between the decal and the parent surface and lets the decal be positioned without making it stick to the surface