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There are several ways to wire it up. As I understand it, the upfitters don't have relays, but lots of folks recommend using one. I haven't looked at it and have no opinion. If you wire an upfitter directly to your light in parallel with your relay, you don't need a diode. Use an upfitter with extra current carrying ability, say a 20A switch for a 15A load. If you want to use a relay on the upfitter, you can run the upfitter switch to the input of the same relay that's on the high beam circuit. That way you only use one relay, but you need a diode to prevent backfeeding the high beam circuit. You can also use two relays wired in parallel, with the high beam circuit driving one and the upfitter driving the other, in which case you don't need a diode.