Seen on M11 yesterday - one Defender towing half of another one - all beautifully turned out and looking as if the rig was ready for a trek across Africa!

On our club stand at the Scottish Land Rover Show this weekend we have had a Freelander1 hard Top with a matching Trailander trailer which is a Freender1 minus the engine bay which is where the towing rig is installed, we have had on the stand the last 3 shows. 2020 Pangea Green 1st Edition D240 New Defender 110 is here and loving it
2018 Melting Silver Mini Countryman PHEV - soon to be replaced
2015MY Corris Grey SDv6 HSE Dynamic, the best car I have ever owned, totally reliable only a cou0le of rattles in 3 years, now no longer in my care
Also in my garage is a 1996 TDi300 Defender 90 County HT made into a fake CSW

I looked online and found this which may be the same set-up that you are referring to:
IMHO the Freelander (1 and especially 2) is an underrated vehicle. I still sometimes find myself looking at them on the LR Approved Used site - there are still some decent low mileage ones around.

The one we had on the stand is more of a camper trailer, still has the driver and front passenger area but the dash has been removed, all the interior trim is gone and it has full length sleeping room for 2! It was home made by the guys who are also members of the Green Road Club. It causes a huge amount of interest on the road and on the stand. It seems that the hardback Freelander1 is the best one to use as it has the roll over hoop that the hard top attaches to to give better stiffening/ rigidity. 2020 Pangea Green 1st Edition D240 New Defender 110 is here and loving it
2018 Melting Silver Mini Countryman PHEV - soon to be replaced
2015MY Corris Grey SDv6 HSE Dynamic, the best car I have ever owned, totally reliable only a cou0le of rattles in 3 years, now no longer in my care
Also in my garage is a 1996 TDi300 Defender 90 County HT made into a fake CSW