The ideal size for a class C on the 176" wheel base is 26.2 feet. Smaller is better. The ratio is 54%. It drove like a large car. I had zero accidents between 2001 and 2009, driving at least 1000 miles per month, in a 27 foot unit.
At a 50% ratio, that becomes 29.3 feet. The RV is still driveable but very tiring, and much harder to control.
I went from a 27 foot to a 28'5". In the first three years I had 4 tail swing accidents. Because of a rebuilt bumper, made from 3/8 inch "U" channel and welded to the frame, there was little damage to the class C. The vehicles that I hit did not fair nearly so well.
The accidents cost me my good driving record and this year, I'll finally have a +1 rating. (I started out at +16, in 2009.)
I would not want a 30 foot (or larger) class C based on the 176 inch wheel base.