Nice Park Service campground, but there this is a no generator restriction for the whole campground. Not all the sites are big enough for a big rig, and it's a first come first served campground. It's a long way in to find that you won't fit anywhere. There's no phone and no wi-fi available, but there is good access to the west side of the park. You might consider camping just outside the park in some commercial parks if you need hook ups and big rig access. We camped here in a Motorhome.
This is the place to come if you want to get away from it all. Cottonwood is in the southwestern corner of Big Bend. There are no hookups and no generators are allowed. The toilets are pit-style. There is drinking water. It's well shaded with tall cottonwoods and has picnic tables. It's very, very quiet. We saw a pack of javelinas grazing near an unoccupied campsite. There's a store with camping supplies and food a half-mile away. It's a great place to see the stars. We camped here in a Motorhome.