I used the RDS kit to hook up my aux tank with a little manual valve and an inline filter on my '11. I usually just leave the valve open all the time and let it gravity fill I haven't had any leaks or issues with it so far. On my '10 I have an electric valve for my aux. tank from Napa. It failed...
I've had my 12 F350 for a couple years now and have had it tuned and deleted for about a year. I'm always looking for improvements on the ol' girl. Looking forward to getting know some of you in here.