I have a Tadibrothers wireless backup camera I put in the back window of my trailer because I didn't want to drill holes. Wired it to a light over the sink. It works great for monitoring traffic behind and backing up.. I did have to get long range antennas for it to be able to monitor it in my tow vehicle because of the length. Because my monitor has two inputs I just added a second wireless camera over the hitch receiver for hooking up. I really like my setup. Have about $350 invested.