Not enough voltage for desktop gaming computer

Need a little more information. When you say "converter" are you meaning "inverter", like one you plug into a cigarette lighter port, and you're using your normal "home charger" to charge and run your "computer"?

When you say "computer" do you mean laptop or an actual desktop system?

 

This makes no sense. An inverter [such as your 1500 watt] takes 12 volt DC input and outputs 115-120 VDC. What are these "converters" you speak of? Power supplies?

But regardless, inverters, even 1500+ watt inverters are not designed to provide long-term sufficient power to run many PC power supplies found in desktops. You will have all sorts of problems with machine power supplies, especially if we're talking about a high-power gaming level machine

 

If your truck had a 1500 watt inverter, does it also have an APU? If so, some APU installations provide an outlet somewhere that provides 120 VAC power when the APU is running. These typically provide more amperage capacity and cleaner power then power from an inverter.

Also, I'm starting to think when you say "converter", you may be talking about a power strip like pictured below? If this is the case, then this does nothing to aid your power supply situation, but I can understand cheap ones shortly becoming toast after trying to power a hungry machine with bad, inadequate power. You better change something up before you burn your truck down

 

I beg to differ. Desktop computers don't pull that much energy. I run a portable AC with a 3000 watt inverter. I can run the microwave at the same time if I high idle. I really don't understand why your puter isn't working properly. Unless it needs pure sine wave.