We just recently purchased a 2016 Thor Hurricane 35C and have been very happy with it. We think it was a great value for the money. In the first few months we have uncovered a few minor issues that were covered by warranty but had great service and support from both Thor and the dealer. Thor has a pretty good support website and you can request all kinds of support documents from them (structural, plumbing, electrical and wiring diagrams, etc.)
There are other Hurricane bunk models and models with sleeper couches, etc. that may be able to meet your requirements.
As to mileage, no Class A is economical. That would not be the reason you would buy one.
Good luck and enjoy!