For those of you that has big rigs, Margaret and I have stayed there for the last 3 years and have no trouble getting our rig in. We have stayed in Mesguite and Sagebrush. This year on our way to Red Bay in April they were building bridges across the low water crossings. A little tight there but they should be through by rally time. I believe there was 7 crossings.
The Sagebrush area has phone service for AT&T but not sure about Verizon. However the Sagebrush area is as far back into the canyon as you can camp. I believe it was 7 miles from the entrance.