Nice campsite with two pad locations each suitable for a 4 man tent complete with the obligatory 2ftx2ftx2ft bear box at around 5900 ft elevation. Trees provide shade.
Boulder Meadow Number #4 is the last in a cluster of 4 camps sites. I wouldn't hesitate to select it again. There is a BM #5 campsite little further up the Pinnacles Trail and before the Pinnacles Campsites.
As all Backcountry campsites at Big Bend it's a leave no trace and pack out your important papers location. Get your permit and reservation in person at the Backcountry office behind the Panther Junction Visitor Center.
The BM-4 campsite is a well marked two tenths of a mile off the Pinnacles Trail and 2.2 miles from the Chisos Basin Amphitheatre parking lot near the camp grounds there. The parking sits at an elevation around 5150 ft for an elevation change of 700 ft.
My crew went at it's typical 30min mile pace, but we stopped frequently for pictures and my 5th grade sons pack adjustments.
You could cut .5 miles at 150 ft of elevation change for some of your party if you drop them off at the parking loop for the visitors center.