winnebage 2016 View airxcel 47000 icing up

Greetings from a fellow Floridian. As fellow Floridian, I can tell you that RV a/c is VERY likely to frost up/ice up on LOW in our humidity. You need as much air flow across the cooling coil as you can get, to get condensation out of the fins before it can freeze. If you have a good-running a/c, the cold air it discharges into the coach might be 50-60 degrees, but part of the coil could be below freezing. If frost/ice forms, it blocks air flow and also insulates that are of the coil. That makes it easier for more frost to form - it spreads! After awhile the freeze sensor finds out and shuts your compressor down, allowing time to thaw.
Your a/c could have been OK all along, or the freeze sensor could be bad or installed wrong. But even if it all good, hot humid FL summer requires HIGH FAN.