'04 Holiday Rambler Ambassador

The way to find out which chassis you have is to go to a wheel well. If there is an air bag in front and behind a tire, then you have the RR8R chassis, if there are no air bags in front and behind, but there are 2 located underneath closer to the frame rails and axle, then you have the RR4R. You can also take your chassis build number found in the passenger front window on a tag and call Monaco Coach and they will tell you what chassis you have. They will also send you a build sheet with serial numbers and model numbers for your vehicle and a wiring diagram and whatever else you may need. Hope this may help, Happy Trails Bert