Hi,
I’ve had one since 2000, coachbuilt onto the 3.2m wheelbase chassis. The box is grossly overweight so mine will never see the high dunes, but in the gently rolling dunes of western Mori it was very well behaved, plodded along with the engine screaming. Our guide in his 4.2l Jeep kept on getting stuck but I think he was a bit too heavy footed (a case of too much power for sand?) and on 15” tyres. I didn’t dare stop to help him, the sand was way too soft to take a stop-start.
They’re very tough, and popular with the German Saharians. No need for any of that LR after market protection bunk, they come with a sump and transfer case guard strong enough to jack even my 5.5t version on.
The 2.5 TD is great, it has a timing CHAIN in a water and sand proof casing, bloody noisy though. At only 100 hp it’s worth looking at tuning options.
With a bit of grinding you can get 9 x 16 tyres under the civvy cab, and the gearing’s designed for them; my workshop manual shows a stripped chassis version with the same ratios but 9x16 tyres, and the military ones have that as standard.

Issues:
The outside CV boot seems to be a bit fragile and requires extra vigilance.
It’s a mini HGV chassis, and as such it’s the chassis that twists first, rather than the suspension (there’s a good photo on exremecamper.com). I’ve seen a Daily van that had to be extensively rewelded and reinforced around the front doors and our furniture unscrews itself from the walls because of the flex in the body.

Graeme, I would recommend a diamond style mounting similar to the Mog system. The caravan lends itself quite well to that: hard mount the caravan’s axle part transversally and then attach a single pivot at the front (and rear if there’s enough chassis) of the caravan. The caravan will follow the twist at the axle level of the truck, and the pivot will allow it to.

Happy preparations
Luke