Can i get a little more info?
Make and Model of the A/C...
Have you considered installing a hard start capacitor?
What is your house battery configuration and has solar and an inverter been looked at? (using a small Gen, upgrade A/C capacitor) use your house batts and inverter to run stuff during the day.
a box/rack/ whatever can be safely added to your trailer bumper... so that an adequate generator and fuel storage can be obtained. IMHO an LP generator is a poor choice seeing your trailer isn't configured to use house propane to run the genny. If you were to configure the trailer to run it, you might have to upgrade the bottle size and or pressure config to run it correctly. A 2800-3000+ watt genny configuration and a hard start capacitor on the A/C would set you up just fine.