Inverters and generators... Need info

It’s a harbor freight 2000 watt inverter generator.
I run synthetic 10w 30 motor oil in it and I have been running it for about 3 years now.
It was cheap enough that if it had a major failure I would just throw it away and get another one.
Here are a few more pictures of my set up.

 

The generator runs the window AC for my whole 10 hr break on one tank of fuel.
I run the electric heater in the winter on the low setting and it will also usually run all night on one tank.
I’m not sure how long an electric heater on the high setting would last as they draw almost maximum watts at about 1800 watts?
I do not run an extra fuel supply at this time but I carry a 2 gallon can that I refuel it with.
The gen box I bought in tractor supply and I made the doors from aluminum diamond plate also purchased from tractor supply.
I also made the brackets that the box sits on and they are clamped to the truck frame with no drilling or welding.
The exhaust is vented out of the back of the box at this time but I have fittings and flexible conduit that I have bought to tap in to my stack pipe under the cab but I haven’t got around to completing that part of the project
yet.
I also run a battery operated carbon monoxide detector in the cab for any safety concerns but I have had zero problems with carbon monoxide gases.
If you need more detailed pictures of how mine is set up feel free to ask and I will get them to you.

 

12,000 BTU Senville Leto

 

You don't have to cash out on the apu. I got a real good 2yr loan on mine lol.

 

I believe the AC unit is a 5500 BTU unit.
The unit itself is just a run of the mill cheap air conditioner I bought at Walmart.
When not in use the window mount and AC unit are stored under the bed in the bunk.
There is a way to run a remote fuel tank if you needed to.
You would mount a remote tank somewhere of your liking and you use a cheap pulse type fuel pump from a lawn tractor.
I have seen YouTube videos on remote fuel tank set ups done this way.