Saw the one at Badminton and it looked really good, if I had the money I would certainly be interested in getting one. Horse area was bright and airy with good head room, nice low ramp too. Small day living with enough space for essentials and tack. No good if needing something to sleep in though.
I saw it too ( the red box at badders ? ) I could never afford one but asked about the payload on them and they said they do a 4 ton box for about a grand more which would take 2 horses and equipment.
I really liked this box had loads of headroom and low centre of gravity and would easily have done me and my panicky tb.
If i come into money will be the first to go and buy one haha.