Total loss of electrical power

I would think it's not wired in right. The Shore power sensor circuit may be tied in to Generator power. Control panel would bypass this shore power sensing circuit.

Check engine fan operation and make sure radiators not packed with dirt and debris.When your on the highway you have the speed you are traveling at air cooling the radiator.

Its possible, but if trim stopped first, then you lost everything else, I would doubt it's the fuse. Unless they're on separate circuits. First check your battery connections and voltage. Next check for power at your fuses. If they're good, check if you have a main power solenoid. If you do, its possible the coil has gotten weak or the contacts are worn. Hopefully this helps. Electrical issues can be a variety of things but are usually simple.

DID YOU CK THE BATTERY DISCONECT SWITCH ?

check your fuel presser and volume

bearings are probly worn--its also sappn power from electrics--getta repair manual from parts store for troublshoot details

loss battery cabel

Battery or batt. post are loose or corrosion.

If the fans your talking about are in the refrigeration section, then the unit is not in defrost. The interior fans shut off during the defrost cycle.
There is a condenser fan motor in the machine section by the compressor. If it fails, the problem you described can occur.
If that fan motor is still, and the compressor is cool to the touch, then no power is getting to the refrigeration section.
Could be a bad thermostat, or the unit has tripped off on the high pressure safety switch. The high pressure switch can be one of 2 styles. Auto reset, which means it will try to restart the compressor when the pressures become normal. The other has a lock out feature that requires it be reset manually. If it goes out on the high pressure switch, once reset, check the condenser fan motor to make sure it is running and/or excessive dirt in the condenser, which must be blown out.
Other causes can be a total loss of refrigerant, or a compressor that won't run.
Short of a broken wire all items listed except for a dirty condensor and reset of the high pressure switch, require a decent knowledge of electrical, Knowledge in the use of a VOM meter and amp-probe, as well as a set of refrigeration gauges.

No, you can pigtail the fan and light together with a wire nut and another piece of wire and connect that to the top of a single pole switch. Connect the Common (hot) wire to the bottom of the switch, and the light and fan will operate at the same time. Just make sure the total Amps of the lighting and the fan doesn't exceed the rating of the switch.

Be sure to disconnect the power to the circuit before making any connections and if you have a metal switch box, wrap around the switch, covering the connection screws with 2-3 complete wraps of electrical tape to prevent accidental shorting against the metal box.

If you want to have the ability to run the fan and light separately, you can get a over/under switch that will fit into the single gang box. That will let you turn on either the light or the fan, or both at once.

If you have any specific issues concerning your particular installation, please use the comment box to post more info or follow up questions and I'll get back to you.

Hope you find this Very Helpful and best regards!