Rear Identification Lamps, Anyone Using Them?

Technically I believe trailers 80" or more in overall width need both front and rear clearance lamps and center rear identification lamps. My trailer currently has the front and rear clearance lamps mounted on the fenders. The fenders and wheels make the trailer more than 80" wide. But so far my trailer lacks the center rear identification lamps. Has anyone added them or obtained a teardrop that has them? I am curious as to how and where the rear ID lights might be installed.
This is a link for required lights. The ones in question are areas 6, 7 & 8.
http://TrailerLights.notlong.com
The next link is to a store and pictures the center rear ID lights they sell. It appears the 3 lights are generally mounted on a bar on six inch centers, installed on the trailer "rear, center - facing rearward - horizontally and as high as practicable". On a boat trailer that would be on the frame below the boat. For a teardrop I am not sure.
http://shop.easternmarine.com/index.cfm ... goryID=485
Thanks! Bill
This is a link for required lights. The ones in question are areas 6, 7 & 8.
http://TrailerLights.notlong.com
The next link is to a store and pictures the center rear ID lights they sell. It appears the 3 lights are generally mounted on a bar on six inch centers, installed on the trailer "rear, center - facing rearward - horizontally and as high as practicable". On a boat trailer that would be on the frame below the boat. For a teardrop I am not sure.
http://shop.easternmarine.com/index.cfm ... goryID=485
Thanks! Bill