I pulled a caravan named Caravette 2 with a GVM of 750kg once on a long journey with the old Merc A-class 160 ,but manual transmission. On short journeys (max 200 km from home) it was bearable but on the 3 week excursion into Namibia up to Etosha and back via Upington it was not nice, in particular when I had a fairly strong headwind resulting in labouring the engine in 3rd gear for hours. Also, slight uphills forced a down shift into 4th and even 3rd gear.
Although I enjoyed the trip and the camping tremendously I felt sorry for the engine and the clutch.
I would not recommend long and extensive caravan towing with any 1.6 l engine….