Hi,
The Sola Basic comes with a place for a #10 input wire. Everything else is up to you.
Be aware that it is 4000 VA not 4000 watts.
If offers three levels of boost at 110, 100, and 90 volts and one level of buck at 135 volts.
I added a 30 amp female outlet. I added a 15 amp outlet to the input side to monitor input voltage and a 15 amp outlet to the output side to monitor output voltage.
I plug a surge protector into the input of the Sola.
I added a handle to make it easier to move around. It is not light weight.
There is a unit that does maintain voltage better (possibly using a switched power supply) mentioned in a thread on rvnet, but I don't remember the name.
If you can find the one that keeps voltage constant, I'd go with it. The reason I did not is because I did not know it existed.