. We are glad to have you join us here and we look forward to reading of your adventures and experiences. I am sure you will enjoy the website and forums. Good luck, stay safe and keep us posted.
I am not sure of your skill level, understanding of how the system works or where you may be located. I would suggest you find out the exact problem before condemning the unit for a new one. It sounds like the front unit may have a start capacitor and/or a bad PTCR that could easily be replaced. If you are comfortable with electricity and want to inspect this; it is in the upper unit on the roof in the box under the shroud. Many times you can see a blown component. Parts can be available at RV shops or even a HVAC parts house. A Supco super boost starting capacitor/relay will also do the job.
Are you aware, that a heat pump is first of all only effective down to about 42 =- degrees, depending on RH? Once the outside coil freezes up and the sensor shuts down the compressor and the unit should default to the axillary heating (furnace(s) or hydronic). If you can let us know where you are or will be in the next few days, maybe someone can point you to a good repair shop that can save the day.