We usually think of A/C performance as "split." Split means how much lower the discharge temperature is below the return air temperature. Others may have better numbers, A/C on when your stored RV is 100* inside. If it's discharging 80* that's a good split. But if you want it to be 70* in your RV, you won't see 70* discharge air till the whole thing is cool enough inside for the return air to be 90*.
Depending on how much you've used the RV and where, you can get some split back by cleaning the unit.
Here's How.