On my ProXP I'm getting power for the whips and rock lights from the pulse bar via a relay.
As for the dealing with 5150 I can't recommend them enough. They have a solid product and stand behind it. I purchased a set of 5150 187 whips and I have broken/damaged three whips in the three years I have had them and they replaced them each time with out an issue.
Finally,
@craigstumph is one of our great vendors here on the forum and will do anything to help you including providing forum discounts.