Welcome Dave and Kay,
Dave, not familiar with your trailer can you show pictures of it and be a little more specific about what you want to accomplish. You know, where you are thinking of mounting the antenna and then where on the inside the radio would be and how/where the wires would "go".
This is difficult from afar at best. One idea though if you have any slides I know of guys routing wires from outside into the trailer through a lower corner of the slide opening.
The best thing I know of at this time to waterproof fittings and connections is a tape called "rescue tape".
Having trouble inserting a link, just google the name and look for the cheapest source.
JIM
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