New horn and Dashcam

I put a dash cam in my RV to protect me from the idiots that tend to cut off larger vehicles. All it takes is one of these people to cut me off and then hit their brakes (needed or not) and I'm rear ending them. I want it all recorded as in general in a rear end wreck the driver behind is found at fault unless there is evidence to the contrary. That is why many truck drivers are using dash cams.

I have already recorded a wreck on mine. I only saw something briefly in my peripheral vision a few lanes over but the camera caught it all...somebody changing lanes into somebody else...from the REAR!!