We have a FWD Sharan and an AWD XC40, the XC40 is more stable towing, especially on wet roads than the FWD Sharan. They both have similar kerb weights.
I understand that when you are towing the AWD centre diff is engaged all the time, rather than just up-to 20 mph, or when wheel slip is detected.
I've observed there is no "re-engagement of AWD" at 55mph which is noticeable if not towing.
Although none of Volvo's line up are "proper 4WD" I was told at an SAE event that one of the big issues is high speed roll overs in solid / live axles vehicles. Seems the same is true for front overlap crash tests....
https://www.youtube.com/watch?v=KEodwUfdEyk