If you have a Super C MH that uses a Freightliner M2 or a full Semi chassis such as a Volvo then you can pull into any good diesel shop and they'll most likely work on it since to them it is a truck they work on all the time. This is why we're only looking at Super C or 5th wheel now, no class A DPs. If it doesn't come with a true Truck cab with all of the safety features and crash test we don't want it.
Here are the contenders for a Super C MH. They all use the Freightliner M2 chassis and are all under $250K or so real world pricing with the Seneca and Force being under $200K, Force HD at about $225K. Only the Seneca doesn't come with an RR or ISL 9L Cummins option. All the rest do or it's standard.
The Dynamax Force, Force HD or DX3:
I really like the top mount awnings on the DX3.
The Renegade Verona:
The Verona and DX3 are higher end but come with the Cummins 9L engine. The Force HD is the same as the Force but comes with the Cummins 9L engine.