Judging by the type of terrain my 4x4 can cope with before having to engage drive to the front axle, it does seem to me that rear wheel drive is good enough for all except the most extreme cases. It is therefore rather unfortunate that there is such a limited choice of rear wheel drive vehicles. In our parts, the E-Class Mercs are by far the most popular towcars for caravans in the 1400kg and over class but other than BMW's there aren't really very many alternatives among current offerings on the market.
Bit of a shame, really.
Bit of a shame, really.