Hi there Chris.
There are many different versions of the Freelander, and without specific information about model, year , body shape, engine and transmission, I cannot be certain the information I have found will necessarily apply to your model. However the same basic principals will apply.
Good towing requires a combination of criteria to be adequately satisfied, but as the first point, you need to ensure is will the car will legally tow the weight of caravan you are considering.
The Freelander model data I have seen indicates the manufacture allows it to tow a trailer of axle weight up to 2000Kg. It has a Mass in service or Mass in running order of 1850Kg. That represents a towing ratio of 108%.That may be ok for some trailers but caravans are "difficult" trailers and so it is very sensible to de-rate the car when towing caravans.
All the best advice suggests that the car should always be as heavy as possible and the trailer as light as possible. Most caravanner's suggest you should never tow a caravan that weighs more than the car and the industry recommends that a novice caravanner should not exceed 85% of the car MIS figure.
So there's your starting point regarding the axle weight of the caravan.1850Kg for 100% or 1573Kg for 85% I must point out that even if you stick to either of these values neither guarantees a good towing match by them selves. Many other factors affect towing such as the compliance of the cars tyres/suspension/chassis can affect the handling, the road and weather conditions, and probably the biggest factor is the driver.
As for single or twin axles, the jury is out, The vast majority of continental caravans of 1600Kg or less are singe axle models. They do not seem to be swayed (sorry for the pun)by the argument that twin axles must be more stable. many UK caravanner's feel they are, but there is no scientific evidence available to confirm the truth or other wise of this. There are some significant down sides to TA caravans. the second axle swallows up the caravans load capacity. There are four tyres to change costing more than teh two of most caravans, and when it comes to fine positioning, TA's are very difficult to manhandle, so often a motor mover is an essential, which also uses up available payload capacity.
What is certain is that all caravans are definitely better behaved when they are fitted with shock absorbers. Most caravan can have them fitted, but if a caravan mover has been fitted they can sometimes prevent shocks from being fitted.
I hope this is food for thought.