New and need advice

Yes I know that lornalou.

I was responding to the question about power only !

As per my first line I don’t know if it’s a match. 

Presumably if you think that 'the more you have the better' you would seem to suggest that 'it' does have something to do with BHP

One website I looked at recommends a maximum 1200kg. For the size of the car that is as big as I would go. 

I think you know what I mean ET

I take it that you mean BHP is important but not the only considerstion

The manual and the plate don't seem to agree with one another. 4005kg (gross train weight) - 2130kg (gross vehicle weight) = 1875kg, but the manual states 1800kg. Weird that because normally, if anything, the stated towing limit is greater than the difference between gross train weight and gross vehicle weight. Anyway, it is only of academic interest if you've ony got a Category B licence, which would limit you to a trailer with an MTPLM of 3500 - 2130 = 1370kg.

I don't want to get involved in any discussions about weight ratios because that usually ends up in needless debate. Suffice to say the all-up weight of the caravan should be as low as reasonably possible compared with the kerbweight of the car. With a gross vehicle of 2130kg, the kerbweight is likely to be around 1600 to 1650kg so a caravan in line with your B licence limit would sound about right. At a pinch I'd go along with the caravan that you have got your eye on, but of course that would mean having to do a Category B+E licence.

Aside from the weight issue, BHP is important yes, but (sorry to bring in another measure) but torque is more important. If your car is highly tuned (a Cooper marque probably is) and develops its best bhp at high revs, then it will not be good for towing. You need low rev "grunt" to tow properly. That's why diesels have proved popular with caravanners, as their engine speeds are low and their power is developed at low engine speed.