My $.02....
The roof vent exhaust fans and the fans below coils (pull/push air) and a refer condenser fan is typically all that is needed to maximize cooling on a properly INSTALLED and running ammonia refer.
Check to see if the refer was PROPERLY installed (many are NOT) based on manufacturer's install instructions for your model (easily found online or included in your manuals when purchased . Ex. Too much gap between refer and rear wall allows hot air to gather and will not allow refer to cool properly.
You need to consider the ambient temps and temps inside RV temps when gauging expectations. If you are checking today, or the next few days......it's **** hot in central/southern AZ....several degrees over 100F today!
Is your RV in shade or sun?
If sun, does sun hit refer side?