What is your towball weight for the caravan.
Also brand and model if you don't mind.
The D22 will have no trouble pulling it and will easily do the steep hills, where you'll be faster than heavy trucks, so don't get caught behind one.
1,500kg is the weight of our off road camper trailer and we've never had any problems.
Our problem is with four batteries, heavy spare wheel, fire pit and bits box on the A frame loaded up for two months away, the tow ball weight is 165kg, which makes the back end sag.
Okay, the set of drawers in the tub made from 19mm ply don't help as well.
After the first long trip(2011), Ultimate suspension (Ingleburn) gave us a price of <$3,000 to beef it up. No lift included.
I can not comment on the waggle from wind as the camper trailer tucks in very nicely and it is easy for Stirleen Moss to hit and sustain 110kms on the open flat highway when she is in the mood. Chilling watching the fuel needle trying to emulate the passing scenery.