As far as I can see the safest are the crash tested chassis, the only ones i know are bluebirds(school bus ) and Prevost (passenger coach) Look for 'passenger rated' crash tested ,air bag etc.
I think a class C that is based on a crash tested van/pick up is a better bet then any class A
however I don know if the cutaway effects it much.
2005 volvo 670 12 speed auto shift
singled, hensley trailer saver smart car "on deck"
Newmar 34 rsks Torrey Pine