The Xplorer is one of the most stable caravans to tow, due partly to it's very heavy nose weight (approx. 115kg) as well as it's well balanced centre of gravity and 15 or 16 inch wheels.
I have been towing the Xplorer for 5 years now and nothing has been able to upset my towing composure, not even the strongest cross winds or trucks on the highway.
I have fitted gas shocks which help to smooth out the ride as the Alko rubber axle is very hard and unforgiving.
Maximum speed that I travel at is 100kmh which gives me good fuel consumption but more importantly very stable towing.
You should manage fine with your terracan.