Donna and Mark, if you're going over to Overton, there are several really good boondocking spots. We prefer Stewart point which is right beside Lake Mead. The road in is a little bumpy but we did it last year with our 34 ft and I'm just as precious with the rig. If you don't want to enter lake mead NP, there's another big free camping area just south of Overton called Poverty flats. Nearest dump and water is in the valley of fire.
If you go the Page route, thoroughly recommend Kaibab Paiute campground for full hookup and the cleanest facilities we have ever found. Super friendly people and $25 a night. Half price with PA card, bargain