A 13.5 will serve you just fine in that trailer. My (our) issue has always been humidity since we live in a desert climate. IF that were an issue I would suggest a small dehumidifier which makes a large difference for us....and is running at the moment. 
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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