Got another take on this...
Get yourself a hand winch (
http://www.northerntool.com/images/p...s/12969_lg.jpg)
Mount it on a plate which hooks over your tow bar (e.g. the first item on
http://www.autow.co.uk/winches/towba...rices_317.html)
And then you can use the winch to both let the trailer down slowly, and pull it up controlled...
Seems like it'd be alot safer then a rope between car and trailer... (no slipping ropes, fly away trailers, snapping ropes or trailers crashing into the back of the car...)
Relatively cheap too -- can get a hand winch for a few quid, and that towbar plate isn't too expensive either... possibly cheaper than an expensive strong rope...
What dya think?
I'm getting a hand winch for home anyway (to help park the boat), so might invest in one of those "connect handwinch to towbar plates" and just keep it in car incase I ever need it....