In theory tighter would be better as it will provide more resistance from sway but that assumes it's within the ability of the device. Locking it down super tight may cause other issues.
Far better is to have a rig that doesn't sway and that's mostly about getting a decent amount of hitch weight (ideally around 15%) on a truck that can handle it.
Tammy & Mike
Ford F250 V10
2021 Gray Wolf
Gemini Catamaran 34'
Full Time spliting time between boat and RV