I think it could be an isopod but am unsure. It doesn't look like ones I am familiar with in houses (usually basements, which is not where this is).
It is about 10mm or 3/8" long, seems to move towards the top of the picture (but mostly is just wiggly), and is slightly hairy. Western USA.
I wish I could get a better photo. I do not have a macro lens but I may be able to get better details with a real camera.
Anyway, from up close observation with a small pen light, it looks like the "legs" really are "hairs," and the legs are all underneath the body, caterpillar style.