I just went to from 32' 6" to 37', I have not noticed much difference.
Pull a bit further forward before backing.
Corners are not much difference. Just turn wide to figure out what you need.
Also, every foot longer makes every situation tighter, ie parking lots, gas stations and so on.
Montana High Country 340BH was on my short list. Literally it was between that trailer and the one I purchased. We never actually set foot in a 340 BH, but we did many other High Country models. We decided against it, due to length, but it would of been roomier inside.