Air conditioner not keeping up in 5th wheel

Ours came with 2 AC's. Of course it was a dealer added option but was installed before we ever saw it. Come to think of it, I did not see one FW on that lot without 2 AC's. I assume maybe it was because they are a TX dealer and with the heat/humidity we get in TX, it is nearly a must to have 2 AC's on larger units. Regardless, I believe 2 AC's really help. We have camped before where we only had 30amp and could only run one AC at a time. Even though the BR is ducted to the downstairs AC, it never got very cool during the day. At night, we would turn off the downstairs and turn on the BR. Also, we have found that when you do have 50amp service and running both units, if you close the vents to the BR, it helps keeps the downstairs cooler and the BR AC is more than sufficient enough to keep the upstairs cool by itself.