Horse TV

Im not sure where this post should be so I hope this is the right place. I am installing two low cost CMOS color outdoor cameras in a horse trailer so we can watch the horses during trips. I know very little about cameras and cable other than one RCA line is for video and the other is for sound. The 12v power I plan on splicing into one of the trailers light power wires. As for the RCA lines I wanted something more durable in the weather and easy to connect that will stay connected so I was thinking of using coax with BNC connections. My question is what type of cable I should buy and if BNC connections can stand up to the weather where they will connect with the truck by the hitch. Is there some sort of rubber housing that is made for this purpose or maybe a different connection all together? Also I plan on just cutting the cable to length and crimping the connections my self and adding rca to BNC where applicable like at the monitor and camera. Any suggestions or ideas would be great since I am trying to do this on as low a budget as possible. I haven't exactly figured out how to view the cameras other than buying one of the in dash 7" lcd head units. Any advice is greatly appreciated

Other than ground noise, would there be any video problems if i just ran a 25ft rca cable out of the receiver and connected it to a 25ft rca cable from the trailer? I would have to wrap the connection to keep it weather proof. The reason I say this is because I already have 4 25ft rca cables and I do not know how to crimp and attach bnc connections.

Great advice. Do you have a different coax line for audio and video? If this is the case should I buy one siamese plus one coax for the audio? The camera I bought is 12v so I am assuming that it will run from the trucks 12v dc?

Is this cable what should be used for this application? BELDEN 8240 RG-58/U TYPE 1C20 SHIELDED E108998 AWM 1364 OR (UL) CMX C(UL) 2028 22:35 ROHS

I bought two Day/night with the led illumination. One for the inside on the side by side horse and one for the back up. I bought 2X25 ft RCA lines but now I am thinking it would be best to buy coax and cut to size and crimp bnc connections. I just dont know what ohm or size is best for this app. Also I was wondering if a product is made to protect the connections while connected and unconnected.