Looking to reserve a spot and recreation.gov says trailers up to 26'. However, pics look like the trailers are bigger and google earth appears that sites are fairly large. My camper is <32' when unfolded. Are the spots big enough to accommodate?

Yes that shouldn't be a issue,lots of space and they will accommodate you if any problems should come up like some sites are narrow so you can ask the hosts before heading in. they are very friendly..they could move you if they have have to to an opening on a falter site. Hopefully all goes well.👍

If you use Google earth to pick a spot that looks long enough, you'll be good. I found a spot that fit my 34' rv plus my SUV.

Yes pretty sure you'll be good