At 2:30 am Large spider transversed a 40 ft porch on a single line of spider web ?
Your prowler is impressive! It might be an Orbweaver spider in family Aranidae. You might be able to find her in the daylight. by following the silk to each end. They sleep in niches like under eaves, behind shutters, in curled single leaves, whorled leaves, and other creative spots. In Autumn she may have an orb web visible that she might be on. The orb webs are easy to find after dark with a flashlight. I’m curious about what suspect your detective work brings in.