I've posted links to the WAC code before, but you are also allowed "spot lights". So just tell them the middle one is a spot light.
See sect 80-110
- 2 fog
- 2 driving
- 2 spot
- 2 "auxiliary passing"
But you can only have four on at any time, and each have specific physical height/mounting requirements, most of which are problematic on an SMB.
On the wiring, what exact brand/model relay are you using? My recollection is that 4000 HIDs draw only a few amps (35W power consumption @ 13.8V = 3A ish) so you should be ok.
You want to minimize two things, voltage drop and points of failure. By using a dual pole relay you've got a good chance if one pole of the relay craps out, the other will work. You want to organize the wiring so the path is pretty direct. I use the alternator fuse link box thing for my driving lights.
Please show us pictures with the lights mounted on the bumper!
I'm looking at the 4000i's - I have the 4000FF HIDs on my Subaru, and have 4 x old school 4000 HIDs (9") which are going to wind up on the roof. I'm going to have an "off road" switch or jumper mounted not accessible from the driver's seat to prove they're not wired up for road ruse, ie disabled. This would be in addition to the 4000i's on the bumper....