Simply not enough cooling (heat transfer) for the heat gain. If both unit are 13,500 BTU, replace with two 15,000 BTU units to gain 3,000 more BTU of cooling. Or add a third air conditioner on the roof as the best option. Three 13,500 BTU units would provide 40,500 BTU of cooling and the units could cycle on their own thermostats as needed based on the heat load they are controlling. Cooling an RV is not like cooling a house. 13,500 BTU is barely adequate to cool 150 square feet in an RV (barely). There is no magic wand when two normally operating AC’s cannot transfer enough heat.
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