If you using an IQ STB then both cables fro the LMB go to the STB
Normally you attach the TV to the STB via a HDMI cable
To run 2 TV's off the same STB you need to purchase a HDMI Male To 2x HDMI Female Y Splitter Adapter Cable. to get the HDMI to an outside would mean getting a cable long enough to be fitted as the van is constructed.
The older style STB the its just standard antenna connectors
The system I have in my van is as follows. A cable from your sat dish to a splitter. Then connect two cables from the splitter to you're vast box and your foxtel box. Install a HDMI splitter ( 4 inputs and 2 out puts. About $65 on E Bay) connect a HDMI cable from your vast, fox box and your DVD player if you have one To the input side of your splitter. Connect a HDMI from the output side of the HDMI splitter to each TV. You can now watch the same station on each tv or fox on one and vast or dvd on the other tv. If you install a infared emitter (on E bay) for you vast, fox, DVD and HDMI splitter you can change station on the boxes from the annex with out having to line up the remote through the van window With the boxes. You can do the same thing at home. Have all your boxes in a cupboard out of sight but still be able to use the remotes.
If you need any further help please feel free to contact me 0414552060