This solar panel can be connected to the battery while it's still hooked up to the travel trailer. It will work for your application provided the battery drain from the trailer(including the propane leak detector) is minimal. This panel provides the battery with 7 watts per hour in ideal conditions(placed in direct sunlight, not cloudy).
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I have one hooked up to cover the drain on my battery for the exact same reason. The battery is never disconnected And I have no issues what so ever. In My instance I mounted a pipe flange on the tongue of the trailer. the panel on a painted and sealed piece of plywood, another flange centered on the back of the plywood, a 45 degree elbow on that flange and a eight foot pipe in between the panel and tongue (2 4 ft pieces and a coupler) . I painted the pipe, and replaced the clamps with rubber trailer type 2 conductor connectors to the battery cable that I already had set up for a maintenance charger, Been running this for four years without a hitch. (my panel DOES have a reverse polarity blocking diode, If the new ones don't they are easy to install, and can be bought for a couple bucks at radio shack as rectifier diodes, you will want something that will handle a minimum of 30 volts 15 amp, to handle any heat issues from sitting in the sun, NOT a small signal diode, other than that, there are no critical specifications, even a 1n9001 or similar would work but if put in the housing it would cook in a relatively short time
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