My camper is presently under cover so I can't take a photograph, but here is what I did.
Mounted the camera to a bracket that is attached to the ladder tube frame. It projects out to the right from the ladder so their is no impediment to using the ladder. As you can see there is very close access to the marker light.
Capture by
camelwhit, on Flickr
This is the bracket(called bull bar bracket). It is designed for mounting a light bar to a vehicle. You will need the 1" diameter size(measure the diameter of your ladder tube to be sure). I only had to drill one extra hole in the bracket arm to attach the camera to it. You can find this on eBay.
Capture1 by
camelwhit, on Flickr