First and most obvious is to see if you have a clean filter and good air flow on the unit. Low air flow due to dirty filters, dirty coils and running the fan on low are 90%+ of the A/C problems. It is a rare occurence to have one low on refrigerant charge, but is can happen.
Another quick check is to be sure you are not blowing cold air direct on the t'stat...this will cause a short cycle.
The t'stats used in RV's are basically cheap junk (and over priced) that tend to have a large amount of hysteris (swing between on and off.
WHile you are running, check the air temp into and out of the A/C unit. It should be making about 20 dF difference across the coil. Much more and it is a pretty god indication of low air flow or possibly low refrigerant.
Ken
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Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot
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