As above - it's not easy to secure the thing, although I've found a way to do it.
If your safety chains are short, this won't work unless you find a (legal) means of lengthening them. Mine are plenty long, but then my caravan was built knowing that a weight distribution hitch would be highly possible and the chains were made long enough to reach the car even with the extra length of the WDH in place.
So, you have say 15 links in the chain and in order to properly hold your towball off the ground let's say you have to connect the chain to the car at link 10. Awesome, you have 5 links dangling ... well, dangle no more! Padlock the last link to the chassis. It's not doing anything it's not rated for so it's MOSTLY legit. There's only one problem.
Towing law in NSW (and probably elsewhere) requires that a trailer be disconnected without the use of tools. That's so that in an accident or a fire, the trailer can be separated, removing it from where occupants may be trapped. It's especially important with a caravan that might have two lovely explosive devices (usually with about 9Kg of liquefied gas/propane in them) mounted right up front aimed at the car.
So the spirit of the law is broken, but not the technicality - a key is not technically a tool.
Thieves might unbolt your coupling, but the safety chains are welded to the trailer chassis and padlocking the bugger to your chassis with a decent padlock will thwart them.
Be careful about the type of padlock used. A favourite trick for most normal padlocks is to super-cool them (liquid Nitrogen) which causes the metal to become extremely brittle, allowing it to shatter when subjected to even a small impact - say, from a hammer.
If your trailer is really valuable, perhaps an alarm system?
As for towing it - a double axle trailer is easier to tow than a single, but it offers more resistance when turning, so parking it requires more push.
Oh and as pointed out ... them clutches ... go gentle on her, don't rev the car too much on take off, let the clutch cool again before feathering it some more. That will extend its life - which is shortened by the heat that the dual mass flywheel just physically can't dissipate for you.
Hope A is doing well!