I now have bought a pickup so I do not need it any more.
It is an all steel galvanised finished unit with an aluminium floor rivetted on I bought here in Germany 3 years ago, it clamps down very hard onto the towball with a large allen screw (see photo) size is 1.00m long x 45cm wide x13cm high.
I have taken it once roundtrip from UK to Bavaria and back with no loosening of the fixing to the ball hitch, transporting a red deer on it would be no problem IMO.
I am returning to the UK through Dover 23 June then will later go onto Gillingham in Dorset and finally Coventry then back to Dover via M1 M25 M2 to Dover so I can drop it off anywhere along that route for free.
I am selling for £115 but no offers.
Marti info ref the sizen