I finally bit the bullet earlier this year and bought one of these
http://www.ebay.co.uk/itm/New-Car-Transporter-Recovery-Trailer-2700kg-4-5m-long-/291817975375?hash=item43f1b4ee4f:g:JekAAOSwGotWk7vw
after borrowing and renting various trailers and beavertail recovery trucks over the years with dubious tyres/electrics/tow hitch etc etc I decided enough was enough and coughed up based on the fact I can keep it at my daughters house and could save myself the money/time/worry using something I dont know about.
My initial idea was to be able to start towing my concours Xr2 to events (something I said Id never do, but just look at the way prices have gone for these things!) and I did tow it 160 miles each way to Sandown racecourse for the International Ford show in April. I also used it to tow the Millie home from Lincoln. Probably wouldn't have bought Millie without the trailer as it,d mean tax/insurance costs. I've also thought it'd be nice to do an odd trackday in the red Puma without worrying about breaking it and not getting home. At a cost of at least £50 a day and the running about collecting/returning the trailers making sense. It also allowed me to buy an engineless Puma for just £50 that would have gone straight to the scrapper the next day as I managed to trailer it to my mates yard 20 miles away ready for me to break when I get round to it.
The biggest reason for getting the trailer though is that I finally have a car that can tow a decent weight - Freelander 2 - which can pull 2 tons. The trailer weights 610kg, can take a load of 2090kg, the Xr weights 875 and the Puma 1100. I've also got a 21 years old Discovery which can pull 3500kg so in theory I can get the Freelander on the trailer and pull it with the Disco. Which reminds me I'm in the local Landie club as well and fancy doing some off roading/quarry stuff with a tatty old disco/vitara etc when I get round to it.
I would be a touch careful about single axle car transporters though, like a caravan..get a puncture at speed and it could be a bit messy. And check your license. Old buggers like me who passed before 1998 (ish) can tow a lot more than after that.