brownie, I bought the EF2400is for some of the same reasons you did. I wanted it to run my 13,500 BTU AC, plus I want to be able to lift it into and around in my truck bed. 75 lbs. is manageable, but don't know for how long.
When stating on generator power:
Charge the batteries some 1st so the on-board battery charger may be at the lower stage.
Turn your fridge to gas only. If it is on automatic, then once you plug in your generator, the fridge will automatically switch to 110 volts.
Run the AC fan up to speed 1st. That might also charge the AC capacitor, eliminating that load, also.
The oil fill is the only complaint that I have with mine. I did the overfill thing 1 time also. I took a straw and did a bunch of "pipettes" to get the extra oil out......but made a bit of a mess.
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Chap , DW Joy, and Fur Baby Sango
2017 F350 Lariat CCSB, SRW, 4x4, 6.7 PS
2017 Grand Design Reflection 337RLS