My vehicle required a kit to activate tail light functions while towed behind a motorhome. Each of my aftermarket tail light assemblies have a clear, colorless lens. The 3 native bulbs each have their own enclosed housing with textured lenses & surfaces to reflect & diffuse the light for a bigger appearance. The red LED bulb & socket required drilling a hole from the back of each tail light assembly to install the socket. This put the LED bulb directly behind the assembly's clear, colorless & smooth lens (it can clearly be observed when unlit). When lit, the bulb is bright enough on its own. But, because it lacks the usual textured reflective surfaces around it & textured red lens in front of it to enhance the light, it has a smaller, pinpoint appearance (compare to a floodlight vs a spot light). The result is during daylight turn signals & brake lights are a little obvious than standard original equipment. I anticipated this effect before installing and asked Blue Ox if in this situation they would still be DOT approved & the answer was yes. I think it is "iffy". I will add supplemental adhesive LED strips that have full functions for added safety. These attach exterior to the tail light assembly or the nearby sheet metal & their wiring will tap into the Blue Ox kit's wiring. If your tail light assemblies are the more common all red outer lens these LED bulbs should be excellent except you would use the "white" LED bulbs.