Welcome to iRV2. There is a Newmar Owners forum on iRV2. It is at Newmar Owner's Forum - iRV2 Forums
Your question is specific to how Newmar coaches are built. It might generate some high quality responses if you posted the question in that forum.
However, what saddens me is the fact you have not been able to use the coach. My wife also has mobility problems. Consider Googling "motor coach mobility lifts". There are quite a few companies that make lifts for motor coach entry and exit. Don't let the mobility issue keep you from enjoying the coach and this great country.
There is also a thread with a bunch of links on iRV2. Go to Handicap RV Information & Handicap Coach Conversions
and check out the links.