All the "Majestic" models are ex-Cruise America (or possibly Cruise Canada) models, made to their specifications. They may be similar to other models, of course, but will differ in various details.
Driving on dirt roads should be not much different from most any other model with similar weight, length, and wheelbase (on the same chassis). They may tend to hold up a bit better to vibration and shaking, being built somewhat more sturdily than some others, but of course that has to be balanced against the amount of use that they've already had. Generally speaking, maintained dirt roads should not be a problem if driven at appropriately slow speeds and if there are not low overhanging tree branches. Off-road trails requiring four wheel drive are, of course, an entirely different matter, and a standard class C motorhome is definitely not the vehicle of choice there.