Not normal, but several people on other forums have mentioned 'squeals' 'squeeks' and other such noises. Ours is 4 years old and is noisy but not irritating. Last one we had in a '15 DRV was about the same--no where near as quiet as a residential unit.
And, welcome to the forum...
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired