Hi Barny, the weight thing is a real surprise but you've obviously put in the right numbers. Might be worth using another calculation site as well, just as a double check.
As I said, the Towcar site gave your car/caravan (using heaviest Troll) a 70% match which is well inside the recommended maximum of 85%.
I never believe anything I'm told and only half believe what I say myself
Any warning lights on the control box? There are 3 on mine, all with some purpose. At least that would indicate power getting to the control box. I wouldn't have thought that you would need to wind the rollers on to the tyres just to test the unit, just watch them spin.
On my Reich, when I liven up the remote I can hear the relays click in the control unit, always good to hear that at least there is some communication going on :)
Good luck :)