If Freon is the problem, it's R-22. I suggest a local air conditioning shop to look at it because it's a basic residential unit, installed in your RV. Explain to the A/C shop that it's NOT a roof unit, but a residential unit, with R-22 which is a common Freon.
But first, a call to RV Products (316-832-4357/3468) might help. They make the unit. Hope this helps.
03 Adventurer 38G, W22, 22.5 Whls
Koni FSD's, TracBar rear, SteerSafe, 50A SurgeGuard, Eternabond; 2012 Honda CRV EXL w/Nav & AWD