Interior pictures

I have had to replace the Cord on mine a few times.
Some trucks (don't ask No Idea) have a tendency to heat the lighter plug up to a point where parts of it will melt.

This Truck I have now doesn't.

 

The Cooler ...

 

XM or Sirius maybe.

 

It's a cheap 400 Watt Cobra. Just using the lighter plug. Really only use it for Cell Phone Tablet and Laptop.

 

In regards to power inverters:

International ProStars have a hole in the floor of the cab that is sealed by a removable rubber plug. The location is right underneath the bunk, and near the battery box. Hard-wiring an inverter would not be difficult, although you would want to put a fuse in the hot line. You would also want to mount the inverter in a place where it could "breathe"; you wouldn't want it to overheat.

On other brands of trucks, I'm pretty certain that one could do something similar. Most vehicles have places in which you can run new wiring, and achieve professional looking results.