I've got a T6 multivan TDI340. I've had a dual axle trailer with decent load on it (from memory weigh bridge van and trailer came in at 3.49T) with 2 passengers in the van.

It towed fine. Very stable, very comfortable at 100kph. Much better feel when keeping the transmission in sports mode. But as mentioned above, would want some room for overtaking. I don't think there would be any issues with hills etc, as it can hold it's own no issue, but lacks the acceleration "punch" that the bigger motors give.