We want to sell our Land Rover to another foreigner in South America. OK, there is info on the web about this and please believe me, I'm doing my research. However, a lot of what I find is unclear, inconclusive or contradictory - which may well be because that's what the process is.

There is talk, for example, of exchanging “between borders” but many – most, indeed - of the borders we've crossed are “dual”: the first desk “is Uruguay”, say; the one next to it“is Argentina”. (An exception to this is Brasil-Uruguay at Chuy.)

Is one supposed to physically change the plates, fastening on suitable new ones? And what about the documentation? Our documentation, with which we've successfully crossed, sometimes on several occasions, in and out of UGY/ARG/CH/PAR/BOL/BR consists of the original sales invoice (new vehicle from dealer) and a document from the police issued before we left that country showing my name, the licence plate number, colour etc. of the vehicle and its engine and chassis number (but not VIN).

But to get those documents transferred to someone else in a way that will ensure they don't have problems?? I can hardly begin to imagine how this can be done.

Is there an "ABC for Dummies" somewhere that spells out how to proceed in this sort of case, or is it the case that the whole business is indeed messy and unclear?

I would so much appreciate advice from anyone who's been involved in this kind of sale or knows about it. We want to do this in Bolivia/northern or central Argentina/Uruguay/Paraguay.

Thanks very much.