carrying capacity and long haul drives.

This might be a solution...

www.horntools.com/suzuki-jimny-roof-rack-aluminum-p-5927-4.html

Glburton, before I make a decision, may I clarify something with you? If that unbraked trailer I pointed you to has a quoted unladen weight of 160kg, and the suzuki is recommended to tow no more than 350kg, am I right to believe that I have 200kg of stuff to stick in it safely? Ignoring various national standards for now - a quick look suggests that most countries seem to insist that the weight must not exceed the car manufacturers recommendations, so I should be ok under 350kg, if I'm understanding this correctly.

In the UK at least if you have the correct driving licence you can legally tow a braked trailer with a gross capacity of 3500 kg behind a Jimny so long as the actual weight of the trailer and it's load do not exceed the maximum train weight of the Jimny so that would mean that if for easy maths the trailer weighed 1000kg you could legally carry not more than 300kg with it regardless of the plate on the trailer giving it's mam as 3500kg. Equally the construction and use regs of 1986 as amended stipulates that an unbraked trailer cannot exceed half the weight of the towing vehicle or 750kg whichever is the lower. In the suzuki Jimny manual it states that the tow limits are 350kg unbraked and 450kg braked unless local regulations differ. Despite repeatedly contacting both dvla dvsa and suzuki uk there doesn't seem to be a legally binding figure for what a Jimny can tow unbraked like there is for braked. People will argue endlessly that it is the lower 350kg mentioned in the manual but seemingly are ignoring the next phrase that says unless local regulations differ which in the UK they do.

How you get on in the rest of the world will entirely depend on those jurisdictions.

It would appear you can as I have just done a bit of research.
As 11/60 says above so providing you don't exceed the Jimny 350kg unbraked rule you will be legal in all other respects as it doesn't come anywhere near the MAM weights.
The 750kg gross weight just indicates the max weight the trailer can carry providing it doesn't fall foul of the MAM weights of the combination of the Jimny/trailer.
Anyway if you were in any doubt you could take it to a public weighbridge to ensure you were under 350kgs loaded.
The harder part is getting a reg plate for your trailer.
As far as the UK is concerned if you had a plate with your car number it would be legal but whether that would be enough for the countries you will be travelling through I don't know.
If you were buying a new trailer they now all come with a certificate of conformity (COC) which is EU law and should be enough for it to get registered over there.
So... possibly if you got a spare car plate made up as it is legal in the UK it should be legal all across the EU until the trailer becomes permanent over there???
What is the worst that would happen? Fine and/or confiscation of trailer??

I've read of a thing called transit plates that allow vehicles to be temporarily driven across EU borders which,I presume is akin to our trade plates?? Can you get anything like that?
Here is a post about trailers in Spain

To register my trailer in Spain I apparently have to go through a type-approval procedure, even though it has an EU certificate of conformity. Why?

The EU type-approval procedure is intended to ensure that trailers and caravans meet the EU's technical safety requirements. If your trailer or caravan has a valid EU certificate of conformity, it means that the prototype of your trailer (or caravan) has already been checked by the relevant authority in the country that has granted the type-approval. Therefore the Spanish authorities cannot impose an additional type-approval or request any additional technical documentation for the purposes of registration or putting into service. They could, however, require a technical inspection to ensure that the trailer (or caravan) has not been modified after delivery to you.

There's no doubt that were I to get a trailer back here, it wold have to undergo an 'MOT' test in order to get a plate and to be associated with my car. Up to that point, any plate on the trailer that is anything other than one obtained by the formal process will render the trailer illegal in Greece. What I don't know, is whether allowance is made for a situation like mine where I'm effectively importing a trailer. (which I suppose may be another issue - import duty) and can therefore have breathing space until I get it tested. But there's no one, it seems, to ask. I intend to use what contacts I have on monday to get an answer to this. But what with this and the question of weight and limits etc, I have to say I'm going right off the idea. There are too many uncertainties. A roofrack and a roofbag, take the passenger seat out, and chuck/give away half my stuff may be the easiest way. This will be the third time in my life I've been forced to get rid of most of my possessions. Ah well. Isn't attachment the source of all pain? And travelling light through life is supposed to be the best way....