You don't buy a motorhome for safety anymore than you do for mpg's. With that said most A's are greater than 16,000 pounds, one of the bigger vehicles on the road. Accidents will more likely be with a far smaller vehicle, 5000 pounds often far less. As long as you and your loved ones are belted in your quite safe unless you are in an accident with a same size or larger vehicle and if two 16000 pound vehicles meet head on an air bag won't matter, just the laws of physics.
As for maintenance I us a local garage that work on cars and oversized vehicles. Far cheaper than most dealers and not nearly the wait time to get it in.
Have fun finding your next adventure!