We are having HD installed tomorrow and we were told that there is no difference to the LNB and wiring except for an HDM lead from the box to the TV
As it will receive the majority of channels that are still non HD it should do the same in the van
The only problem that I can see is that the HD box it bigger than the Sky+ box and the standard digibox and will need a bigger space in the caravan
If the engineer says different I will report back!!