Oh yea... anything to get voltage up into the 12's and not the low 11's like I originally got on my first connector use. On the highway I rarely get interference and connected to the marker lights the voltage is about 11.7v and works pretty good. When I connected the camera to my 4 pin trailer plug the video was very solid even on the side of my house where I see the most signal flutter on the screen while powered by the marker lights.
The second camera I got was a bit more money ($140) but had a 1" bigger display (3.5"). Though both work quite fine for keeping tabs on the rear. I leave mine on all the time as I can't see anything out my rear view mirror when the camper is on. I've 2 velcro strip loops that slide over each end of the mirror that I attach the camera to. Never fallen off and rough roads are about all I ever see.
The bigger display makes the activity going on with my ATV trailer a bit more visible ... such as it is more noticable when it gets airborn over big bumps. Or, I've just hit bigger bumps since the switch? With the smaller display all is quite visible and really helps for backing things up and such, but the bigger display does seem to make the trailer movements a bit more evident while traveling.
The picture in the previous post is of the smaller display and the trailer pictured there is sitting about 5' or so behind the camper. Where I mounted the camera gives a great rear view but is a couple feet out from my rear bumper. Here's my rear camera mount with marker light power tap.