Doug, be careful about the weight ratings. We only take 100kg of wine with us for short weekends!
I don't know your level of knowledge about caravaning, so please feel free to ignore this if your are already aware!
The caravan has a unladen weight, and a maximum weight. (when loaded etc)
This has nothing to do with what your car can tow.
It is the maximum weight that your caravan and tyres can handle.
The police do spot checks, and are very strict about the weights.
There is also a "nose" weight that is very important.
Again, you car will have a maximum "nose" weight on the tow bar. (anywhere between 50-150kg etc)
The caravan will also have a nose weight, which is based on the weight of the caravan.
Always try to aim for the highest weight of the caravan, without exceeding the tow ball maximum.
So if the caravans nose weight is 75kg, and the car is 100kg. The most you can go to is 75kg.
I would aim to get 75kg, as long as this doesn't lead to a "nose down" look when attached to your car.
As your photos show, you know about putting heavy objects on the floor when towing. Just move them forward or back until you get the right target nose weight.
A light nose weight increases the risk of swaying/snaking. Too heavy and you risk straining the tow ball, or grounding the "a" frame.
I used a cheap nose gauge at first. But eventually fitted one built into the jockey wheel. (cannot forget or lose a built in one!)
Having a twin axle helps the above problems, but doesn't eradicate them.
Other things to check are the tyre age. It printed on the side walls.
Any tyre over five years old is considered spent. Caravan tyres rarely wear out, so age is the only way to know when new ones are due.
With the length of your rig, be wary of grounding on ramps, and be aware the back end "steps out" on tight turns. (can obstruct on coming traffic when turning left etc)
I tow a 2.7t trailer and find that way easier to tow than my 1.5t caravan.
It's the bulk of the caravan that makes it harder to handle. Wind has far more effect than on my trailer.
Reversing is about the same for difficulty, and very different swing needed between the two.
I assume like me you find it a doddle. Pulling a trailer all day makes for very good practise!