Thanks for the feedback on the Travato 1900# sounds a much better figure!
However, it is not the original Aktiv 1 that I was interested in, but rather the Aktiv 2.
If you look at the specs of these two vehicles on the gohymer.com website, you find:
Aktiv1 2500 chassis, OCCC = 1254# (which isn't bad)
Aktiv2 3500 chassis, OCCC = 750# (which to me seems marginally acceptable)
I originally thought their website info might be wrong, although the 2 is 15" longer,
but in an online chat with gohymer, they confirmed that 750# is the correct number for the 2.
So why the Travato would be so much higher for the same vehicle, same layout, I don't understand!