Ford owns the compressor, the rv builder owns the rest of the system.
Is the compressor running?
If not, is there oil blown all over the area of the compressor?
I had a hose that rubbed on something which caused a loss of coolant. Luckily I took it to a shop that only worked ac issues. They had to make a hose. They also had all the parts they needed. I would find a shop that specializes in automotive air conditioning. Not a chain shop like firestone or pep boys for example, or the other fix em up joints, just a small shop for ac.