Another possible solution or addition:
I, too, am cautious about where I put my RV. Although I use solar charged batteries for LED markers where appropriate, reflective tape is another suggestion that requires no battery power. I put tape on my bumper corners and slideouts for added visibility.
SOLAS tape is extremely reflective, used on life-saving equipment such as jackets and life rafts, and is available in marine stores and the internet. It is a good choice for slideouts and is easy to see.
Typical reflective tape comes in many colors, although SOLAS tape is typically reflective white. Most tapes have a sticky back and adhere to a number of surfaces.
Just a thought.