I think kknowlton was pretty good in his description of the two. With a 35ft trailer you're going to feel something either way.
Sway will be consistent, another words every time you get to say 60mph it starts.
Effects from wind differences will be here and there like a windy day, truck or bus passing etc etc.
Then there is all of the other thousands of different 'handling' issues that come from the TV like tire psi, oversized tires, worn steering components, short wheel base etc, etc.
A trip to the scales is the only real way to find out if everything is dialed in like it should be.