I couldn't get the Price link to work but Googling "Stacker Destacker price" brought up lots of hits. Seems like it's about $150 but if that's the only way to get the two Sat signals into my RV without ripping open walls, etc then the price is OK for me.
All the hits I got were for UK companies as Sky TV seems to have gone the same route as my provider, Shaw Direct, and used a HD PVR that MUST have two separate signals from the LNBs on the dish..
I still need to find out what grade of Coax is in the "Cable" wiring in the LaCrosse. If it's the same as the "Satellite" coax then I can probably use both at the same time (assuming they both come out in the entertainment unit). I don't get the trailer for a week or so and I'll physically check how it's wired then. I'll probably also contact Forest River Tech Support and see if they can provide specs and schematics for this unit.
Thanks to all for the help