We've camped at Bridge Bay, but it was at the end of the season and we just drove in, no prior reservations. At the time we had a 25' travel trailer. They assigned us a roadside site, where you park parallel to the road. There were back in sites and we saw several fifth wheels there, big ones. If you look at pictures online of this campground, you'll see big Class A's in the area up front. Call them.
*Note - sign up at Campendium.com. It's a great reference site. Search for Bridge Bay and you'll see 50 + photos of the CG.