Leiobunum politum fits the harvestman (although I don't know much about these, so there might be other possibilities). Understory of swampy woods, & absolutely huge (easily 5 cm across, including legs).
But it's the red things that I was really fascinated by. Turns out they are parasitic mites. And bugguide.net/node/view/36531/bgimage gives the these as nymphs of Erythraeidae, genus Leptus.