Did a RD hardware for my V955 using a smartcord, an inline coupler, and some phone cord. Here's what I did if anyone is interested in doing the same.
1. Examine the pinouts at the phone plug on your smartcord; it should be BRGY.
2. Determine if the coupler you are using is a straight through or crossover. I tested it using cords plugged in to each side and checked for continuity with a multimeter across wires as well just to make sure its a straight-through. I also cracked mine open to see that the wires do not crossover inside.
3. Same goes for the additional cable that you will be using, it too must be straight-through. Orient both of the plugs in the same manner, and look at them from the top. If one plug is BRGY left-to-right, the other plug must be YGRB left-to-right.
4. My first cable I tested to see if the RD powers up and the remote mute/volume works was 25 feet long, but I had no intention to use such a long cord; it was for testing purposes only. After a few minutes, the unit displayed LOW VOLT warning. Voltmeter indicated just under 12 volts across the red/green pair (power/ground) at the end of the 25' wire indicating a substantial voltage drop across the long wire.
5. Went to pick up a shorter cable (7 feet) from Walmart, plugged everything together and powered on the RD so I can check for abnormal behaviors on the way home. Made one run against a K-band speed sign which checked out ok. Then I got a blip of Ka, a pause, then a ramp up to full Ka and I see an oncoming State Trooper. Good range/warning considering most State Troopers here use 35.5GHz. The setup worked, now I just had to go home and hide the wires out of sight.
6. I ran the wire from the RD to the base of the windshield, across to the left towards the bottom of the A-pillar. Tucked it away down the side, into the upper side of the drivers kick panel and into the center stack. The smartcord wire goes into the same area and the two are connected with the coupler. Plenty of space there to hide the excess coils of the smartcord.
The 7' wire may not be for everyone. The 7' length worked PERFECT for me but I have my RD left of center now for easy reach, high enough to get radar yet low enough to try pick up laser scatter. I've only had a couple laser hits since getting this RD but in each case the person driving next to me got the ticket. If I was getting a laser ticket, its nice to know what I was hit with so I don't have to second guess what equipment the LEO used. For the high mounters, 10'-12' of phone wire should be sufficient as long as you check that the voltage does not drop along such length.