One reason that the factory uses staples and no adhesive to install the fascia boards is that when (when, ...not if) the owner eventually opens the slides and there is an object between the fascia and the wall, it reduces the chance of severe damage to the RV wall and slide structure.
If something solid was to get in between the wall and fascia, and the fascia was rigidly attached to the slide, the hydraulics are strong enough to do serious damage to the RV like break the exterior wall from the floor, bend the aluminum framing in the wall, etc., and at the very least break the fascia board.(another reason they assemble this way is that it is quick and cheap)
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