I would look at a super C that uses a Freightliner chassis, if you are worried about front end crashes. This has a truck frame with a substantial diesel engine for front end protection also air bags and compliant restraint system such as shoulder belts and seat belts. Along with head restraints from whiplash with high back chairs.
Just an opinion based on design and crash requirements of trucks vs a glass enclosure in a class A motor home.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67, TDR 135K+miles