Freedom Caravans are extremely lightweight (ours is 650kg). They are made of GRP (fibreglass to me) so any leaks are easily fixed. They are also dead basic and small, with a price tag to match. If you want luxury, hot water, a bathroom, full oven, TV aerial etc, they are not for you. But if you are planning to use the caravan site's facilities, and want to keep your current car, it's worth having a look at one. The only UK dealer is in Stafford, and the website isn't wonderful, but there are usually a couple on eBay which will give you an impression.
I got a towbar fitted by asking the local caravan dealers where the best place was. The same place came up time after time, so I went there - and they were very good. SGM in Cardiff, if that's any good for you.
Liz