I bought an extra 5 LNB dish and bring 2 boxes (H24) from home. I didn't go with SWM in the camper. DirecTv sent me 2 B-band converters (just make sure you change the settings in your boxes to "multiswitch". My extra dish has 4 output leads so I run 2 coaxes to the TT (pain in the butt sometimes). Aiming my 5 LNB HD dish is another story entirely. Some times I can find all 5 sats in as little as 10 minutes and other times I have played with it for hours to get decent signals due to some obstructions etc. Overkill? Maybe for some but, we are usually parked in one place for up to 2 weeks and my DW doesn't miss any of her favorite shows.
I tried running one coax thru a generic Radio Shack splitter but found that didn't work (something about the 13v or 18v sat. signals not "passing thru" the splitter). However, a specific satellite splitter may work as I've heard they allow the signal to pass thru. I just acquired one and will try it out in the spring.