The AC's used on RV's are capillary tube sealed systems. No service port. So if the capillaries get plugged, you are reduced to paying for a new unit. And a true leak, it's defiantly a dead unit. Does the compressor run? Low Freon and it will not, fan only. Clogged capillaries, compressor will run, but the evaporator will ice up. The factories are backed up and lead time for new units run around 60-90 days minimum.
A good AC will output cold air down to 45 degree. Even with 96 degree outside, of course you are living in a big box in the sun. You should get at least a 20-30 degree delta, IF the AC works.
Retired USN MCPO
RV Service Tech
RAM pulling 2021 GS TT