Actually, the EASIEST place I found to tap into the i-bus is on the TV module

The reason is that it is VERY easily accessible as the plug you need to gat to is the one nearest to you, in full visibility where you can easily get your hand to pop the catch on the plug.

My setup was as follows:

I made up a power lead to connect the Resler i/f to the accessory socket in the cargo area (RH side). I did this to be 100% certain that there could be no short between +12v and any of the other pins on the TV module. I then ran a single wire from the interface to the i-bus pin on the TV module. All I did was take the shell off the plug, poke the wire into the back of the plug with the i-bus pin, put the shell back on the plug and re-plug it into the VM.

Worked like a charm and I can set this up in no more than about 2 mins now.