David pretty much nailed it. The difference is in how an entertainer coach is used. It is not uncommon for the driver's seat to be isolated from the front stateroom. He needs some provision for keeping the lights in the rear of the coach from interfereing with his visibility via reflections in the windshield when he is driving at night.

The interiors are generally durable but lack design features we have in a MH. It is not uncommon for the interior to be modular. For example it may take little effort to convert a pair of bunks into a full height closet and vice versa.

It may have OTR, but it is likely to have at least 5 roof airs. It is likely to have 2 gensets. While we can dry camp and want the battery power and inverters to do that, it is not uncommon for the generator on an entertainier coach to be turned on at the start of the tour and kep running anytime the group is in the bus or about to be in the bus. The second genset is backup. Ditto with the 5th roof air.

Expect very little water and waste holding. The group uses the bus to travel, they do not live in it. Some leasors of entertainer coaches will not permit anyone to do #2 in a bus toilet. The kitchen if you want to call it that is for snacks, not for cooking. The rear stateroom is not likely to be a bedroom, but a second sitting area. The entertainer coaches see a lot of miles so in two years it may have the same number of miles typically found in a 10 to 15 year old MH.

The shell is not the same as a MH. It has a longer wheelbase, although future MH shells are going to have the same wheelbase as entertainer shells so that is not likely to be a show stopper. But bottom line, as David says is an entertainer coach has a significant number of changes that have to be made to it to have one begin to match a MH. But the reverse is also true. Our coaches and interiors will not meet the requirements of the typical group that leases an entertainer coach, nor will it have the durability or redundancy those coaches require