We just got our '10 3210 about a month ago and also have the blue lights. I haven't really used them much, but they would help pick out you unit in a campground. We started our cross country trek (Calgary to Newfoundland and back) a bit ago and just pulled into a Walmart lot in Charlettown PEI last night where there were 18 other rigs pulled in for the night, including one Landmark.
I don't think the lights would be a bigger issue than the other lights on the trailer like the side and rear "scare" lights that would also be illegal if you left them on while on the road. I'm not sure the purposeof the blue lights, but infernos have a big emblemn that lights up on the front, perhaps this is heartlandsesponse to this.
We now have about 5000 km on the 3210 and the tires (front and rear axels especially) are wearing quite a bit. The unit really turns nice but it sure is hard on tires.
Jay.
2010 Cyclone 3210
2006 F-350 6.0