13 pin to 13 pin extension lead

I don’t know if anyone else has this issue, but the 13 pin electric socket on my car is hidden away out of sight under the rear bumper. It’s a detachable tow bar so I guess that’s the idea

My current way of comfortably connecting this to the caravan, is to lay down on a yoga mat so I can connect the plug without getting gravel rash!

I’ve seen some long extensions leads you can buy, but basically I want something that I can leave plugged in for the season, sort of around 6 inch long hanging down (i have a Range Rover so fairly high) so I can easily just plug the caravan in without practising yoga!!

Any ideas, preferably not involving making it myself?