Unless you outfit your rv with a SWM setup, you will need to run two separate coax cables from the dish then one directly to each receiver with no splitters. It doesn't matter which pigtail you use on the slimline dish. I run two HD receivers in my fiver and run two cables from the dish. One goes to the "satellite prep" feed to the living room TV receiver (direct run). The other cable runs from the dishto the "cable in" feed to the 2nd TV receiver. I had to modify the rv's factory coax wiring to isolate the "cable in" feed from the antenna amplifier for this to work.